21693475 has 12 divisors (see below), whose sum is σ = 27076144. Its totient is φ = 17241120.

The previous prime is 21693437. The next prime is 21693493. The reversal of 21693475 is 57439612.

It is not a de Polignac number, because 21693475 - 2¹⁷ = 21562403 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1162 + ... + 6688.

Almost surely, 2^21693475 is an apocalyptic number.

21693475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21693475 is a deficient number, since it is larger than the sum of its proper divisors (5382669).

21693475 is a wasteful number, since it uses less digits than its factorization.

21693475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5694 (or 5689 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 21693475 is about 4657.6254679826. The cubic root of 21693475 is about 278.8964857101.

The spelling of 21693475 in words is "twenty-one million, six hundred ninety-three thousand, four hundred seventy-five".