21002021021022 has 32 divisors (see below), whose sum is σ = 42172128520704. Its totient is φ = 6972660240000.

The previous prime is 21002021021017. The next prime is 21002021021071. The reversal of 21002021021022 is 22012012020012.

It is a junction number, because it is equal to n+sod(n) for n = 21002021020992 and 21002021021010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136187323 + ... + 136341449.

It is an arithmetic number, because the mean of its divisors is an integer number (1317879016272).

Almost surely, 2^{21002021021022} is an apocalyptic number.

21002021021022 is an abundant number, since it is smaller than the sum of its proper divisors (21170107499682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002021021022 is a wasteful number, since it uses less digits than its factorization.

21002021021022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244864.

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

Adding to 21002021021022 its reverse (22012012020012), we get a palindrome (43014033041034).

The spelling of 21002021021022 in words is "twenty-one trillion, two billion, twenty-one million, twenty-one thousand, twenty-two".