21201022011021 has 16 divisors (see below), whose sum is σ = 28940082408000. Its totient is φ = 13801203709568.

The previous prime is 21201022010951. The next prime is 21201022011067. The reversal of 21201022011021 is 12011022010212.

It is a cyclic number.

It is not a de Polignac number, because 21201022011021 - 2¹³ = 21201022002829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201022013021) 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, 401919216 + ... + 401971961.

It is an arithmetic number, because the mean of its divisors is an integer number (1808755150500).

Almost surely, 2^{21201022011021} is an apocalyptic number.

It is an amenable number.

21201022011021 is a deficient number, since it is larger than the sum of its proper divisors (7739060396979).

21201022011021 is a wasteful number, since it uses less digits than its factorization.

21201022011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803891388.

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

Adding to 21201022011021 its reverse (12011022010212), we get a palindrome (33212044021233).

The spelling of 21201022011021 in words is "twenty-one trillion, two hundred one billion, twenty-two million, eleven thousand, twenty-one".