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111331201021 = 383290681987
BaseRepresentation
bin110011110101111011…
…0110100111111111101
3101122100212021222212121
41213223312310333331
53311001241413041
6123051142002541
711020614410665
oct1475366647775
9348325258777
10111331201021
1143240619147
12196b0716451
13a66323a711
145561d071a5
152d68dec7d1
hex19ebdb4ffd

111331201021 has 4 divisors (see below), whose sum is σ = 111621883392. Its totient is φ = 111040518652.

The previous prime is 111331201001. The next prime is 111331201049. The reversal of 111331201021 is 120102133111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120102133111 = 398693012419.

It is a cyclic number.

It is not a de Polignac number, because 111331201021 - 211 = 111331198973 is a prime.

It is a super-2 number, since 2×1113312010212 (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111331200986 and 111331201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111331201001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145340611 + ... + 145341376.

It is an arithmetic number, because the mean of its divisors is an integer number (27905470848).

Almost surely, 2111331201021 is an apocalyptic number.

It is an amenable number.

111331201021 is a deficient number, since it is larger than the sum of its proper divisors (290682371).

111331201021 is an equidigital number, since it uses as much as digits as its factorization.

111331201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290682370.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 111331201021 its reverse (120102133111), we get a palindrome (231433334132).

The spelling of 111331201021 in words is "one hundred eleven billion, three hundred thirty-one million, two hundred one thousand, twenty-one".

Divisors: 1 383 290681987 111331201021