21551440355304 has 32 divisors (see below), whose sum is σ = 53881789796640. Its totient is φ = 7183388264000.

The previous prime is 21551440355303. The next prime is 21551440355311. The reversal of 21551440355304 is 40355304415512.

It is not an unprimeable number, because it can be changed into a prime (21551440355303) 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, 26160162 + ... + 26971409.

It is an arithmetic number, because the mean of its divisors is an integer number (1683805931145).

Almost surely, 2^{21551440355304} is an apocalyptic number.

21551440355304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21551440355304 is an abundant number, since it is smaller than the sum of its proper divisors (32330349441336).

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

21551440355304 is a wasteful number, since it uses less digits than its factorization.

21551440355304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53148481 (or 53148477 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 42.

The spelling of 21551440355304 in words is "twenty-one trillion, five hundred fifty-one billion, four hundred forty million, three hundred fifty-five thousand, three hundred four".