21660152420 has 24 divisors (see below), whose sum is σ = 45490032000. Its totient is φ = 8663353952.

The previous prime is 21660152401. The next prime is 21660152431. The reversal of 21660152420 is 2425106612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257141 + ... + 330819.

It is an arithmetic number, because the mean of its divisors is an integer number (1895418000).

Almost surely, 2^21660152420 is an apocalyptic number.

21660152420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21660152420 is an abundant number, since it is smaller than the sum of its proper divisors (23829879580).

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

21660152420 is a wasteful number, since it uses less digits than its factorization.

21660152420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88387 (or 88385 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 21660152420 in words is "twenty-one billion, six hundred sixty million, one hundred fifty-two thousand, four hundred twenty".