21275160 has 64 divisors (see below), whose sum is σ = 67586400. Its totient is φ = 5339136.

The previous prime is 21275129. The next prime is 21275171. The reversal of 21275160 is 6157212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21275160.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3175 + ... + 7254.

Almost surely, 2^21275160 is an apocalyptic number.

21275160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21275160 is an abundant number, since it is smaller than the sum of its proper divisors (46311240).

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

21275160 is a wasteful number, since it uses less digits than its factorization.

21275160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10460 (or 10456 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 21275160 is about 4612.5004065040. The cubic root of 21275160 is about 277.0921856457.

The spelling of 21275160 in words is "twenty-one million, two hundred seventy-five thousand, one hundred sixty".