21357160 has 32 divisors (see below), whose sum is σ = 52423200. Its totient is φ = 7766080.

The previous prime is 21357107. The next prime is 21357191. The reversal of 21357160 is 6175312.

It is a super-2 number, since 2×21357160² = 912256566531200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23830 + ... + 24709.

It is an arithmetic number, because the mean of its divisors is an integer number (1638225).

Almost surely, 2^21357160 is an apocalyptic number.

21357160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21357160 is an abundant number, since it is smaller than the sum of its proper divisors (31066040).

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

21357160 is a wasteful number, since it uses less digits than its factorization.

21357160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48561 (or 48557 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 21357160 is about 4621.3807460541. The cubic root of 21357160 is about 277.4477243736.

The spelling of 21357160 in words is "twenty-one million, three hundred fifty-seven thousand, one hundred sixty".