21022122121021 has 12 divisors (see below), whose sum is σ = 24470619156000. Its totient is φ = 18006941100120.

The previous prime is 21022122120991. The next prime is 21022122121067. The reversal of 21022122121021 is 12012122122012.

It is not a de Polignac number, because 21022122121021 - 2³³ = 21013532186429 is a prime.

It is a super-2 number, since 2×21022122121021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21022122121021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022122121321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143029585 + ... + 143176486.

It is an arithmetic number, because the mean of its divisors is an integer number (2039218263000).

Almost surely, 2^{21022122121021} is an apocalyptic number.

It is an amenable number.

21022122121021 is a deficient number, since it is larger than the sum of its proper divisors (3448497034979).

21022122121021 is a wasteful number, since it uses less digits than its factorization.

21022122121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286207584 (or 286207577 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21022122121021 its reverse (12012122122012), we get a palindrome (33034244243033).

Subtracting from 21022122121021 its reverse (12012122122012), we obtain a palindrome (9009999999009).

The spelling of 21022122121021 in words is "twenty-one trillion, twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, twenty-one".