21377275 has 12 divisors (see below), whose sum is σ = 26720512. Its totient is φ = 16964640.

The previous prime is 21377269. The next prime is 21377303. The reversal of 21377275 is 57277312.

It is a happy number.

It is not a de Polignac number, because 21377275 - 2¹⁵ = 21344507 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21377275.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192 + ... + 6541.

Almost surely, 2^21377275 is an apocalyptic number.

21377275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21377275 is a deficient number, since it is larger than the sum of its proper divisors (5343237).

21377275 is a wasteful number, since it uses less digits than its factorization.

21377275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6870 (or 6865 counting only the distinct ones).

The product of its digits is 20580, while the sum is 34.

The square root of 21377275 is about 4623.5565315026. The cubic root of 21377275 is about 277.5348007109.

The spelling of 21377275 in words is "twenty-one million, three hundred seventy-seven thousand, two hundred seventy-five".