21753367680 has 128 divisors (see below), whose sum is σ = 75642465600. Its totient is φ = 5273538560.

The previous prime is 21753367667. The next prime is 21753367697. The reversal of 21753367680 is 8676335712.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 493875 + ... + 536114.

Almost surely, 2^21753367680 is an apocalyptic number.

21753367680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21753367680 is an abundant number, since it is smaller than the sum of its proper divisors (53889097920).

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

21753367680 is a wasteful number, since it uses less digits than its factorization.

21753367680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030022 (or 1030010 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 21753367680 in words is "twenty-one billion, seven hundred fifty-three million, three hundred sixty-seven thousand, six hundred eighty".