21200211210021 has 8 divisors (see below), whose sum is σ = 28268166723264. Its totient is φ = 14132864918400.

The previous prime is 21200211210001. The next prime is 21200211210043. The reversal of 21200211210021 is 12001211200212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21200211210021 - 2¹⁰ = 21200211208997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200211210001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152224201 + ... + 152363406.

It is an arithmetic number, because the mean of its divisors is an integer number (3533520840408).

Almost surely, 2^{21200211210021} is an apocalyptic number.

It is an amenable number.

21200211210021 is a deficient number, since it is larger than the sum of its proper divisors (7067955513243).

21200211210021 is a wasteful number, since it uses less digits than its factorization.

21200211210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304610811.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21200211210021 its reverse (12001211200212), we get a palindrome (33201422410233).

The spelling of 21200211210021 in words is "twenty-one trillion, two hundred billion, two hundred eleven million, two hundred ten thousand, twenty-one".