21372760 has 32 divisors (see below), whose sum is σ = 48258000. Its totient is φ = 8519040.

The previous prime is 21372737. The next prime is 21372761. The reversal of 21372760 is 6727312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21372761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13195 + ... + 14725.

Almost surely, 2^21372760 is an apocalyptic number.

21372760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21372760 is an abundant number, since it is smaller than the sum of its proper divisors (26885240).

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

21372760 is a wasteful number, since it uses less digits than its factorization.

21372760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891 (or 1887 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 21372760 is about 4623.0682452242. The cubic root of 21372760 is about 277.5152603679.

The spelling of 21372760 in words is "twenty-one million, three hundred seventy-two thousand, seven hundred sixty".