21371955022 has 64 divisors (see below), whose sum is σ = 38265696000. Its totient is φ = 8846081280.

The previous prime is 21371955013. The next prime is 21371955023. The reversal of 21371955022 is 22055917312.

It is a happy number.

It is a super-2 number, since 2×21371955022² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21371955023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1275354 + ... + 1292002.

It is an arithmetic number, because the mean of its divisors is an integer number (597901500).

Almost surely, 2^21371955022 is an apocalyptic number.

21371955022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21371955022 is a deficient number, since it is larger than the sum of its proper divisors (16893740978).

21371955022 is a wasteful number, since it uses less digits than its factorization.

21371955022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16801.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 21371955022 in words is "twenty-one billion, three hundred seventy-one million, nine hundred fifty-five thousand, twenty-two".