21293375 has 8 divisors (see below), whose sum is σ = 26574288. Its totient is φ = 17034600.

The previous prime is 21293353. The next prime is 21293387. The reversal of 21293375 is 57339212.

It is not a de Polignac number, because 21293375 - 2⁸ = 21293119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85049 + ... + 85298.

It is an arithmetic number, because the mean of its divisors is an integer number (3321786).

Almost surely, 2^21293375 is an apocalyptic number.

21293375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21293375 is a deficient number, since it is larger than the sum of its proper divisors (5280913).

21293375 is an equidigital number, since it uses as much as digits as its factorization.

21293375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170362 (or 170352 counting only the distinct ones).

The product of its digits is 11340, while the sum is 32.

The square root of 21293375 is about 4614.4745096273. The cubic root of 21293375 is about 277.1712417597.

The spelling of 21293375 in words is "twenty-one million, two hundred ninety-three thousand, three hundred seventy-five".