21112020000021 has 16 divisors (see below), whose sum is σ = 29807749306944. Its totient is φ = 13245626713344.

The previous prime is 21112020000007. The next prime is 21112020000047. The reversal of 21112020000021 is 12000002021112.

It is not a de Polignac number, because 21112020000021 - 2¹⁸ = 21112019737877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112019999961 and 21112020000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112020000821) 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, 17067415 + ... + 18262548.

It is an arithmetic number, because the mean of its divisors is an integer number (1862984331684).

Almost surely, 2^{21112020000021} is an apocalyptic number.

It is an amenable number.

21112020000021 is a deficient number, since it is larger than the sum of its proper divisors (8695729306923).

21112020000021 is a wasteful number, since it uses less digits than its factorization.

21112020000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35341700.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21112020000021 its reverse (12000002021112), we get a palindrome (33112022021133).

The spelling of 21112020000021 in words is "twenty-one trillion, one hundred twelve billion, twenty million, twenty-one", and thus it is an aban number.