21121122212022 has 32 divisors (see below), whose sum is σ = 48277027636992. Its totient is φ = 6034584237984.

The previous prime is 21121122211979. The next prime is 21121122212041. The reversal of 21121122212022 is 22021222112112.

It is a super-2 number, since 2×21121122212022² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21121122212022.

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, 13240968 + ... + 14750100.

It is an arithmetic number, because the mean of its divisors is an integer number (1508657113656).

Almost surely, 2^{21121122212022} is an apocalyptic number.

21121122212022 is an abundant number, since it is smaller than the sum of its proper divisors (27155905424970).

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

21121122212022 is a wasteful number, since it uses less digits than its factorization.

21121122212022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842372.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21121122212022 its reverse (22021222112112), we get a palindrome (43142344324134).

The spelling of 21121122212022 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twelve thousand, twenty-two".