21375666573600 has 144 divisors (see below), whose sum is σ = 70228055304288. Its totient is φ = 5646904995840.

The previous prime is 21375666573593. The next prime is 21375666573631. The reversal of 21375666573600 is 637566657312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41362489 + ... + 41876088.

It is an arithmetic number, because the mean of its divisors is an integer number (487694828502).

Almost surely, 2^{21375666573600} is an apocalyptic number.

21375666573600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21375666573600 is an abundant number, since it is smaller than the sum of its proper divisors (48852388730688).

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

21375666573600 is a wasteful number, since it uses less digits than its factorization.

21375666573600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83238707 (or 83238694 counting only the distinct ones).

The product of its (nonzero) digits is 28576800, while the sum is 57.

The spelling of 21375666573600 in words is "twenty-one trillion, three hundred seventy-five billion, six hundred sixty-six million, five hundred seventy-three thousand, six hundred".