21720073333400 has 96 divisors (see below), whose sum is σ = 54433760183040. Its totient is φ = 8012340495360.

The previous prime is 21720073333379. The next prime is 21720073333423. The reversal of 21720073333400 is 433337002712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1016429 + ... + 6668828.

It is an arithmetic number, because the mean of its divisors is an integer number (567018335240).

Almost surely, 2^{21720073333400} is an apocalyptic number.

21720073333400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21720073333400 is an abundant number, since it is smaller than the sum of its proper divisors (32713686849640).

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

21720073333400 is a wasteful number, since it uses less digits than its factorization.

21720073333400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7686373 (or 7686364 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 35.

The spelling of 21720073333400 in words is "twenty-one trillion, seven hundred twenty billion, seventy-three million, three hundred thirty-three thousand, four hundred".