111201200021 has 4 divisors (see below), whose sum is σ = 111221486592. Its totient is φ = 111180913452.

The previous prime is 111201199981. The next prime is 111201200027. The reversal of 111201200021 is 120002102111.

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.

It is a cyclic number.

It is not a de Polignac number, because 111201200021 - 2¹⁴ = 111201183637 is a prime.

It is a super-2 number, since 2×111201200021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111201199975 and 111201200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111201200027) 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, 10135061 + ... + 10146026.

It is an arithmetic number, because the mean of its divisors is an integer number (27805371648).

Almost surely, 2^111201200021 is an apocalyptic number.

It is an amenable number.

111201200021 is a deficient number, since it is larger than the sum of its proper divisors (20286571).

111201200021 is an equidigital number, since it uses as much as digits as its factorization.

111201200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20286570.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111201200021 its reverse (120002102111), we get a palindrome (231203302132).

The spelling of 111201200021 in words is "one hundred eleven billion, two hundred one million, two hundred thousand, twenty-one".