21704875 has 16 divisors (see below), whose sum is σ = 27406080. Its totient is φ = 17160000.

The previous prime is 21704857. The next prime is 21704887. The reversal of 21704875 is 57840712.

It is a happy number.

It is not a de Polignac number, because 21704875 - 2¹⁵ = 21672107 is a prime.

It is a super-2 number, since 2×21704875² = 942203197531250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21704875.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10150 + ... + 12100.

It is an arithmetic number, because the mean of its divisors is an integer number (1712880).

Almost surely, 2^21704875 is an apocalyptic number.

21704875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21704875 is a deficient number, since it is larger than the sum of its proper divisors (5701205).

21704875 is an equidigital number, since it uses as much as digits as its factorization.

21704875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055 (or 2045 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 21704875 is about 4658.8491068074. The cubic root of 21704875 is about 278.9453308608.

The spelling of 21704875 in words is "twenty-one million, seven hundred four thousand, eight hundred seventy-five".