21001220102022 has 32 divisors (see below), whose sum is σ = 43451488562400. Its totient is φ = 6758906289408.

The previous prime is 21001220102003. The next prime is 21001220102053. The reversal of 21001220102022 is 22020102210012.

It is a junction number, because it is equal to n+sod(n) for n = 21001220101992 and 21001220102010.

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, 10448754 + ... + 12295482.

It is an arithmetic number, because the mean of its divisors is an integer number (1357859017575).

Almost surely, 2^{21001220102022} is an apocalyptic number.

21001220102022 is an abundant number, since it is smaller than the sum of its proper divisors (22450268460378).

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

21001220102022 is a wasteful number, since it uses less digits than its factorization.

21001220102022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912120.

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

Adding to 21001220102022 its reverse (22020102210012), we get a palindrome (43021322312034).

The spelling of 21001220102022 in words is "twenty-one trillion, one billion, two hundred twenty million, one hundred two thousand, twenty-two".