21074375 has 20 divisors (see below), whose sum is σ = 30102864. Its totient is φ = 14448000.

The previous prime is 21074359. The next prime is 21074393. The reversal of 21074375 is 57347012.

It is not a de Polignac number, because 21074375 - 2⁴ = 21074359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 1967 + ... + 6783.

Almost surely, 2^21074375 is an apocalyptic number.

21074375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21074375 is a deficient number, since it is larger than the sum of its proper divisors (9028489).

21074375 is an frugal number, since it uses more digits than its factorization.

21074375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4844 (or 4829 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 21074375 is about 4590.6835003080. The cubic root of 21074375 is about 276.2177402049.

The spelling of 21074375 in words is "twenty-one million, seventy-four thousand, three hundred seventy-five".