21112020020021 has 24 divisors (see below), whose sum is σ = 24604891382016. Its totient is φ = 18062127861120.

The previous prime is 21112020019991. The next prime is 21112020020041. The reversal of 21112020020021 is 12002002021112.

It is not a de Polignac number, because 21112020020021 - 2²² = 21112015825717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112020019978 and 21112020020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112020020041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135580010 + ... + 135735636.

It is an arithmetic number, because the mean of its divisors is an integer number (1025203807584).

Almost surely, 2^{21112020020021} is an apocalyptic number.

It is an amenable number.

21112020020021 is a deficient number, since it is larger than the sum of its proper divisors (3492871361995).

21112020020021 is a wasteful number, since it uses less digits than its factorization.

21112020020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160809 (or 160802 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21112020020021 its reverse (12002002021112), we get a palindrome (33114022041133).

The spelling of 21112020020021 in words is "twenty-one trillion, one hundred twelve billion, twenty million, twenty thousand, twenty-one".