21472256655340 has 24 divisors (see below), whose sum is σ = 45093302240112. Its totient is φ = 8588604897600.

The previous prime is 21472256655277. The next prime is 21472256655341. The reversal of 21472256655340 is 4355665227412.

It is a super-2 number, since 2×21472256655340² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21472256655341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18018511 + ... + 19173190.

It is an arithmetic number, because the mean of its divisors is an integer number (1878887593338).

Almost surely, 2^{21472256655340} is an apocalyptic number.

21472256655340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21472256655340 is an abundant number, since it is smaller than the sum of its proper divisors (23621045584772).

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

21472256655340 is a wasteful number, since it uses less digits than its factorization.

21472256655340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37220577 (or 37220575 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 52.

The spelling of 21472256655340 in words is "twenty-one trillion, four hundred seventy-two billion, two hundred fifty-six million, six hundred fifty-five thousand, three hundred forty".