111021021000021 has 16 divisors (see below), whose sum is σ = 161524517875200. Its totient is φ = 67269052097520.

The previous prime is 111021021000007. The next prime is 111021021000047. The reversal of 111021021000021 is 120000120120111.

It is not a de Polignac number, because 111021021000021 - 2¹⁹ = 111021020475733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111021020999970 and 111021021000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021021000121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410242065 + ... + 410512598.

It is an arithmetic number, because the mean of its divisors is an integer number (10095282367200).

Almost surely, 2^{111021021000021} is an apocalyptic number.

111021021000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111021021000021 is a deficient number, since it is larger than the sum of its proper divisors (50503496875179).

111021021000021 is a wasteful number, since it uses less digits than its factorization.

111021021000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820758776.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111021021000021 its reverse (120000120120111), we get a palindrome (231021141120132).

The spelling of 111021021000021 in words is "one hundred eleven trillion, twenty-one billion, twenty-one million, twenty-one", and thus it is an aban number.