21374275 has 18 divisors (see below), whose sum is σ = 28705380. Its totient is φ = 15780960.

The previous prime is 21374267. The next prime is 21374279. The reversal of 21374275 is 57247312.

It is not a de Polignac number, because 21374275 - 2³ = 21374267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21374279) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1696 + ... + 6754.

Almost surely, 2^21374275 is an apocalyptic number.

21374275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21374275 is a deficient number, since it is larger than the sum of its proper divisors (7331105).

21374275 is a wasteful number, since it uses less digits than its factorization.

21374275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5095 (or 5077 counting only the distinct ones).

The product of its digits is 11760, while the sum is 31.

The square root of 21374275 is about 4623.2320945417. The cubic root of 21374275 is about 277.5218174011.

It can be divided in two parts, 2137 and 4275, that multiplied together give a triangular number (9135675 = T₄₂₇₄).

The spelling of 21374275 in words is "twenty-one million, three hundred seventy-four thousand, two hundred seventy-five".