21694475 has 12 divisors (see below), whose sum is σ = 29347080. Its totient is φ = 15777600.

The previous prime is 21694441. The next prime is 21694481. The reversal of 21694475 is 57449612.

It is not a de Polignac number, because 21694475 - 2¹⁶ = 21628939 is a prime.

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, 39170 + ... + 39719.

It is an arithmetic number, because the mean of its divisors is an integer number (2445590).

Almost surely, 2^21694475 is an apocalyptic number.

21694475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21694475 is a deficient number, since it is larger than the sum of its proper divisors (7652605).

21694475 is a wasteful number, since it uses less digits than its factorization.

21694475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78910 (or 78905 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 21694475 is about 4657.7328175841. The cubic root of 21694475 is about 278.9007710570.

It can be divided in two parts, 21 and 694475, that added together give a palindrome (694496).

The spelling of 21694475 in words is "twenty-one million, six hundred ninety-four thousand, four hundred seventy-five".