111212023200021 has 40 divisors (see below), whose sum is σ = 168294226111704. Its totient is φ = 73180281876480.

The previous prime is 111212023200013. The next prime is 111212023200077. The reversal of 111212023200021 is 120002320212111.

111212023200021 is a `hidden beast` number, since 1 + 1 + 121 + 202 + 320 + 0 + 0 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 52134588900 + 111159888611121 = 228330^2 + 10543239^2 .

It is not a de Polignac number, because 111212023200021 - 2³ = 111212023200013 is a prime.

It is a super-2 number, since 2×111212023200021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111212023199967 and 111212023200003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212023200001) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16043220 + ... + 21904541.

Almost surely, 2^{111212023200021} is an apocalyptic number.

It is an amenable number.

111212023200021 is a deficient number, since it is larger than the sum of its proper divisors (57082202911683).

111212023200021 is an equidigital number, since it uses as much as digits as its factorization.

111212023200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37948243 (or 37948234 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 111212023200021 its reverse (120002320212111), we get a palindrome (231214343412132).

The spelling of 111212023200021 in words is "one hundred eleven trillion, two hundred twelve billion, twenty-three million, two hundred thousand, twenty-one".