21468375 has 32 divisors (see below), whose sum is σ = 39698880. Its totient is φ = 11448000.

The previous prime is 21468371. The next prime is 21468383. The reversal of 21468375 is 57386412.

It is not a de Polignac number, because 21468375 - 2² = 21468371 is a prime.

It is a super-2 number, since 2×21468375² = 921782250281250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21468371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195 + ... + 6555.

It is an arithmetic number, because the mean of its divisors is an integer number (1240590).

Almost surely, 2^21468375 is an apocalyptic number.

21468375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21468375 is a deficient number, since it is larger than the sum of its proper divisors (18230505).

21468375 is an equidigital number, since it uses as much as digits as its factorization.

21468375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6385 (or 6369 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 21468375 is about 4633.3977813264. The cubic root of 21468375 is about 277.9284834065.

The spelling of 21468375 in words is "twenty-one million, four hundred sixty-eight thousand, three hundred seventy-five".