21158133560 has 32 divisors (see below), whose sum is σ = 48027101040. Its totient is φ = 8388355584.

The previous prime is 21158133559. The next prime is 21158133697. The reversal of 21158133560 is 6533185112.

It is a self number, because there is not a number n which added to its sum of digits gives 21158133560.

It is a congruent number.

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, 2335982 + ... + 2345021.

Almost surely, 2^21158133560 is an apocalyptic number.

21158133560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21158133560 is an abundant number, since it is smaller than the sum of its proper divisors (26868967480).

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

21158133560 is a wasteful number, since it uses less digits than its factorization.

21158133560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4681127 (or 4681123 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 21158133560 in words is "twenty-one billion, one hundred fifty-eight million, one hundred thirty-three thousand, five hundred sixty".