21376720833600 has 168 divisors, whose sum is σ = 76509227390688. Its totient is φ = 5182235340800.

The previous prime is 21376720833539. The next prime is 21376720833607. The reversal of 21376720833600 is 633802767312.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 21376720833600.

It is not an unprimeable number, because it can be changed into a prime (21376720833607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 202378269 + ... + 202483868.

Almost surely, 2^{21376720833600} is an apocalyptic number.

21376720833600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21376720833600 is an abundant number, since it is smaller than the sum of its proper divisors (55132506557088).

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

21376720833600 is a wasteful number, since it uses less digits than its factorization.

21376720833600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404862173 (or 404862158 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 48.

The spelling of 21376720833600 in words is "twenty-one trillion, three hundred seventy-six billion, seven hundred twenty million, eight hundred thirty-three thousand, six hundred".