21259990145400 has 96 divisors (see below), whose sum is σ = 65907109643760. Its totient is φ = 5669232624640.

The previous prime is 21259990145323. The next prime is 21259990145479. The reversal of 21259990145400 is 454109995212.

It is a super-2 number, since 2×21259990145400² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38493604 + ... + 39041996.

Almost surely, 2^{21259990145400} is an apocalyptic number.

21259990145400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21259990145400 is an abundant number, since it is smaller than the sum of its proper divisors (44647119498360).

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

21259990145400 is a wasteful number, since it uses less digits than its factorization.

21259990145400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613025 (or 613016 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 51.

The spelling of 21259990145400 in words is "twenty-one trillion, two hundred fifty-nine billion, nine hundred ninety million, one hundred forty-five thousand, four hundred".