21376275 has 24 divisors (see below), whose sum is σ = 35478384. Its totient is φ = 11356800.

The previous prime is 21376253. The next prime is 21376279. The reversal of 21376275 is 57267312.

It is not a de Polignac number, because 21376275 - 2¹⁶ = 21310739 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21376279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31237 + ... + 31913.

It is an arithmetic number, because the mean of its divisors is an integer number (1478266).

Almost surely, 2^21376275 is an apocalyptic number.

21376275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21376275 is a deficient number, since it is larger than the sum of its proper divisors (14102109).

21376275 is a wasteful number, since it uses less digits than its factorization.

21376275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111 (or 1106 counting only the distinct ones).

The product of its digits is 17640, while the sum is 33.

The square root of 21376275 is about 4623.4483883785. The cubic root of 21376275 is about 277.5304730759.

The spelling of 21376275 in words is "twenty-one million, three hundred seventy-six thousand, two hundred seventy-five".