21427002175 has 12 divisors (see below), whose sum is σ = 26572417560. Its totient is φ = 17139708320.

The previous prime is 21427002167. The next prime is 21427002209. The reversal of 21427002175 is 57120072412.

It is not a de Polignac number, because 21427002175 - 2³ = 21427002167 is a prime.

It is a congruent 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, 211209 + ... + 295741.

It is an arithmetic number, because the mean of its divisors is an integer number (2214368130).

Almost surely, 2^21427002175 is an apocalyptic number.

21427002175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21427002175 is a deficient number, since it is larger than the sum of its proper divisors (5145415385).

21427002175 is a wasteful number, since it uses less digits than its factorization.

21427002175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94682 (or 94677 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

Adding to 21427002175 its reverse (57120072412), we get a palindrome (78547074587).

The spelling of 21427002175 in words is "twenty-one billion, four hundred twenty-seven million, two thousand, one hundred seventy-five".