21200002212021 has 32 divisors (see below), whose sum is σ = 29094279303168. Its totient is φ = 13725518748480.

The previous prime is 21200002212019. The next prime is 21200002212023. The reversal of 21200002212021 is 12021220000212.

It is an interprime number because it is at equal distance from previous prime (21200002212019) and next prime (21200002212023).

It is not a de Polignac number, because 21200002212021 - 2¹ = 21200002212019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200002212023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 355931775 + ... + 355991331.

It is an arithmetic number, because the mean of its divisors is an integer number (909196228224).

Almost surely, 2^{21200002212021} is an apocalyptic number.

It is an amenable number.

21200002212021 is a deficient number, since it is larger than the sum of its proper divisors (7894277091147).

21200002212021 is a wasteful number, since it uses less digits than its factorization.

21200002212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84641.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21200002212021 its reverse (12021220000212), we get a palindrome (33221222212233).

The spelling of 21200002212021 in words is "twenty-one trillion, two hundred billion, two million, two hundred twelve thousand, twenty-one".