21022102011021 has 16 divisors (see below), whose sum is σ = 28094452803648. Its totient is φ = 13982252000000.

The previous prime is 21022102011019. The next prime is 21022102011067. The reversal of 21022102011021 is 12011020122012.

It is a cyclic number.

It is not a de Polignac number, because 21022102011021 - 2¹ = 21022102011019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022102011011) 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, 8189146 + ... + 10445396.

It is an arithmetic number, because the mean of its divisors is an integer number (1755903300228).

Almost surely, 2^{21022102011021} is an apocalyptic number.

It is an amenable number.

21022102011021 is a deficient number, since it is larger than the sum of its proper divisors (7072350792627).

21022102011021 is a wasteful number, since it uses less digits than its factorization.

21022102011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263452.

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

Adding to 21022102011021 its reverse (12011020122012), we get a palindrome (33033122133033).

The spelling of 21022102011021 in words is "twenty-one trillion, twenty-two billion, one hundred two million, eleven thousand, twenty-one".