21965275 has 12 divisors (see below), whose sum is σ = 28839672. Its totient is φ = 16538240.

The previous prime is 21965249. The next prime is 21965351. The reversal of 21965275 is 57256912.

It is not a de Polignac number, because 21965275 - 2⁵ = 21965243 is a prime.

It is a Duffinian 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, 25417 + ... + 26266.

It is an arithmetic number, because the mean of its divisors is an integer number (2403306).

Almost surely, 2^21965275 is an apocalyptic number.

21965275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21965275 is a deficient number, since it is larger than the sum of its proper divisors (6874397).

21965275 is a wasteful number, since it uses less digits than its factorization.

21965275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51710 (or 51705 counting only the distinct ones).

The product of its digits is 37800, while the sum is 37.

The square root of 21965275 is about 4686.7126005336. The cubic root of 21965275 is about 280.0564299531.

The spelling of 21965275 in words is "twenty-one million, nine hundred sixty-five thousand, two hundred seventy-five".