21838475 has 6 divisors (see below), whose sum is σ = 27079740. Its totient is φ = 17470760.

The previous prime is 21838469. The next prime is 21838501. The reversal of 21838475 is 57483812.

It is not a de Polignac number, because 21838475 - 2²² = 17644171 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 436745 + ... + 436794.

It is an arithmetic number, because the mean of its divisors is an integer number (4513290).

Almost surely, 2^21838475 is an apocalyptic number.

21838475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21838475 is a deficient number, since it is larger than the sum of its proper divisors (5241265).

21838475 is an equidigital number, since it uses as much as digits as its factorization.

21838475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873549 (or 873544 counting only the distinct ones).

The product of its digits is 53760, while the sum is 38.

The square root of 21838475 is about 4673.1654154331. The cubic root of 21838475 is about 279.5164912297.

The spelling of 21838475 in words is "twenty-one million, eight hundred thirty-eight thousand, four hundred seventy-five".