21269375 has 10 divisors (see below), whose sum is σ = 26578992. Its totient is φ = 17015000.

The previous prime is 21269359. The next prime is 21269401. The reversal of 21269375 is 57396212.

It is not a de Polignac number, because 21269375 - 2⁴ = 21269359 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 9 ways as a sum of consecutive naturals, for example, 16391 + ... + 17640.

Almost surely, 2^21269375 is an apocalyptic number.

21269375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21269375 is a deficient number, since it is larger than the sum of its proper divisors (5309617).

21269375 is an frugal number, since it uses more digits than its factorization.

21269375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34051 (or 34036 counting only the distinct ones).

The product of its digits is 22680, while the sum is 35.

The square root of 21269375 is about 4611.8732636533. The cubic root of 21269375 is about 277.0670683476.

The spelling of 21269375 in words is "twenty-one million, two hundred sixty-nine thousand, three hundred seventy-five".