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12113021 = 15777153
BaseRepresentation
bin101110001101…
…010001111101
3211210101221102
4232031101331
511100104041
61111342445
7204646634
oct56152175
924711842
1012113021
116923768
124081a25
13268158b
14187451b
1510e409b
hexb8d47d

12113021 has 4 divisors (see below), whose sum is σ = 12190332. Its totient is φ = 12035712.

The previous prime is 12112979. The next prime is 12113047. The reversal of 12113021 is 12031121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6300100 + 5812921 = 2510^2 + 2411^2 .

It is a cyclic number.

It is not a de Polignac number, because 12113021 - 26 = 12112957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112993 and 12113011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12113221) 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, 38420 + ... + 38733.

It is an arithmetic number, because the mean of its divisors is an integer number (3047583).

Almost surely, 212113021 is an apocalyptic number.

It is an amenable number.

12113021 is a deficient number, since it is larger than the sum of its proper divisors (77311).

12113021 is an equidigital number, since it uses as much as digits as its factorization.

12113021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77310.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 12113021 is about 3480.3765600866. The cubic root of 12113021 is about 229.6593634314.

Adding to 12113021 its reverse (12031121), we get a palindrome (24144142).

The spelling of 12113021 in words is "twelve million, one hundred thirteen thousand, twenty-one".

Divisors: 1 157 77153 12113021