21880375 has 16 divisors (see below), whose sum is σ = 29791008. Its totient is φ = 15912000.

The previous prime is 21880373. The next prime is 21880379. The reversal of 21880375 is 57308812.

It is not a de Polignac number, because 21880375 - 2¹ = 21880373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21880375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21880373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6582 + ... + 9331.

It is an arithmetic number, because the mean of its divisors is an integer number (1861938).

Almost surely, 2^21880375 is an apocalyptic number.

21880375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21880375 is a deficient number, since it is larger than the sum of its proper divisors (7910633).

21880375 is a wasteful number, since it uses less digits than its factorization.

21880375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15939 (or 15929 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 21880375 is about 4677.6463098443. The cubic root of 21880375 is about 279.6951401323.

The spelling of 21880375 in words is "twenty-one million, eight hundred eighty thousand, three hundred seventy-five".