21896975 has 12 divisors (see below), whose sum is σ = 27219240. Its totient is φ = 17474400.

The previous prime is 21896951. The next prime is 21896999. The reversal of 21896975 is 57969812.

It is an interprime number because it is at equal distance from previous prime (21896951) and next prime (21896999).

It is not a de Polignac number, because 21896975 - 2¹⁴ = 21880591 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, 12716 + ... + 14334.

It is an arithmetic number, because the mean of its divisors is an integer number (2268270).

Almost surely, 2^21896975 is an apocalyptic number.

21896975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21896975 is a deficient number, since it is larger than the sum of its proper divisors (5322265).

21896975 is a wasteful number, since it uses less digits than its factorization.

21896975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170 (or 2165 counting only the distinct ones).

The product of its digits is 272160, while the sum is 47.

The square root of 21896975 is about 4679.4203700886. The cubic root of 21896975 is about 279.7658544241.

The spelling of 21896975 in words is "twenty-one million, eight hundred ninety-six thousand, nine hundred seventy-five".