21893288220 has 36 divisors (see below), whose sum is σ = 66409641480. Its totient is φ = 5838210144.

The previous prime is 21893288203. The next prime is 21893288233. The reversal of 21893288220 is 2288239812.

21893288220 is a `hidden beast` number, since 21 + 89 + 328 + 8 + 220 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 60814510 + ... + 60814869.

Almost surely, 2^21893288220 is an apocalyptic number.

21893288220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21893288220 is an abundant number, since it is smaller than the sum of its proper divisors (44516353260).

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

21893288220 is a wasteful number, since it uses less digits than its factorization.

21893288220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121629394 (or 121629389 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 21893288220 in words is "twenty-one billion, eight hundred ninety-three million, two hundred eighty-eight thousand, two hundred twenty".