21904216253280 has 120 divisors (see below), whose sum is σ = 77303629906272. Its totient is φ = 5841124330752.

The previous prime is 21904216253279. The next prime is 21904216253317. The reversal of 21904216253280 is 8235261240912.

21904216253280 is a `hidden beast` number, since 2 + 1 + 90 + 4 + 21 + 6 + 2 + 532 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×21904216253280² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 845057112 + ... + 845083031.

Almost surely, 2^{21904216253280} is an apocalyptic number.

21904216253280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21904216253280 is an abundant number, since it is smaller than the sum of its proper divisors (55399413652992).

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

21904216253280 is a wasteful number, since it uses less digits than its factorization.

21904216253280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690140170 (or 1690140153 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 21904216253280 in words is "twenty-one trillion, nine hundred four billion, two hundred sixteen million, two hundred fifty-three thousand, two hundred eighty".