21238500 has 48 divisors (see below), whose sum is σ = 61850880. Its totient is φ = 5663200.

The previous prime is 21238487. The next prime is 21238513. The reversal of 21238500 is 583212.

It is an interprime number because it is at equal distance from previous prime (21238487) and next prime (21238513).

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, 5580 + ... + 8579.

It is an arithmetic number, because the mean of its divisors is an integer number (1288560).

Almost surely, 2^21238500 is an apocalyptic number.

21238500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21238500 is an abundant number, since it is smaller than the sum of its proper divisors (40612380).

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

21238500 is a wasteful number, since it uses less digits than its factorization.

21238500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14181 (or 14169 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21238500 is about 4608.5247097092. The cubic root of 21238500 is about 276.9329382766.

The spelling of 21238500 in words is "twenty-one million, two hundred thirty-eight thousand, five hundred".