21052475 has 48 divisors (see below), whose sum is σ = 29998080. Its totient is φ = 14572800.

The previous prime is 21052469. The next prime is 21052481. The reversal of 21052475 is 57425012.

It is an interprime number because it is at equal distance from previous prime (21052469) and next prime (21052481).

It is not a de Polignac number, because 21052475 - 2⁶ = 21052411 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 447902 + ... + 447948.

It is an arithmetic number, because the mean of its divisors is an integer number (624960).

Almost surely, 2^21052475 is an apocalyptic number.

21052475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21052475 is a deficient number, since it is larger than the sum of its proper divisors (8945605).

21052475 is a wasteful number, since it uses less digits than its factorization.

21052475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 21052475 is about 4588.2976145843. The cubic root of 21052475 is about 276.1220273608.

Adding to 21052475 its reverse (57425012), we get a palindrome (78477487).

The spelling of 21052475 in words is "twenty-one million, fifty-two thousand, four hundred seventy-five".