21753914 has 64 divisors (see below), whose sum is σ = 43545600. Its totient is φ = 7907328.

The previous prime is 21753913. The next prime is 21753923. The reversal of 21753914 is 41935712.

It is not an unprimeable number, because it can be changed into a prime (21753911) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 244382 + ... + 244470.

It is an arithmetic number, because the mean of its divisors is an integer number (680400).

Almost surely, 2^21753914 is an apocalyptic number.

21753914 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

21753914 is a wasteful number, since it uses less digits than its factorization.

21753914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207.

The product of its digits is 7560, while the sum is 32.

The square root of 21753914 is about 4664.1091325139. The cubic root of 21753914 is about 279.1552516112.

The spelling of 21753914 in words is "twenty-one million, seven hundred fifty-three thousand, nine hundred fourteen".