21489915175 has 6 divisors (see below), whose sum is σ = 26647494848. Its totient is φ = 17191932120.

The previous prime is 21489915143. The next prime is 21489915191. The reversal of 21489915175 is 57151998412.

It is not a de Polignac number, because 21489915175 - 2⁵ = 21489915143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 429798279 + ... + 429798328.

Almost surely, 2^21489915175 is an apocalyptic number.

21489915175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21489915175 is a deficient number, since it is larger than the sum of its proper divisors (5157579673).

21489915175 is an equidigital number, since it uses as much as digits as its factorization.

21489915175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859596617 (or 859596612 counting only the distinct ones).

The product of its digits is 907200, while the sum is 52.

The spelling of 21489915175 in words is "twenty-one billion, four hundred eighty-nine million, nine hundred fifteen thousand, one hundred seventy-five".