21238875 has 128 divisors (see below), whose sum is σ = 47923200. Its totient is φ = 9072000.

The previous prime is 21238873. The next prime is 21238883. The reversal of 21238875 is 57883212.

It is not a de Polignac number, because 21238875 - 2¹ = 21238873 is a prime.

It is a super-2 number, since 2×21238875² = 902179622531250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21238873) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 685110 + ... + 685140.

It is an arithmetic number, because the mean of its divisors is an integer number (374400).

Almost surely, 2^21238875 is an apocalyptic number.

21238875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21238875 is an abundant number, since it is smaller than the sum of its proper divisors (26684325).

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

21238875 is a wasteful number, since it uses less digits than its factorization.

21238875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 75 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 21238875 is about 4608.5653950009. The cubic root of 21238875 is about 276.9345681663.

The spelling of 21238875 in words is "twenty-one million, two hundred thirty-eight thousand, eight hundred seventy-five".