21872753 has 16 divisors (see below), whose sum is σ = 25622400. Its totient is φ = 18285696.

The previous prime is 21872749. The next prime is 21872777. The reversal of 21872753 is 35727812.

It is a cyclic number.

It is not a de Polignac number, because 21872753 - 2² = 21872749 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21872723) 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 15 ways as a sum of consecutive naturals, for example, 69725 + ... + 70037.

It is an arithmetic number, because the mean of its divisors is an integer number (1601400).

Almost surely, 2^21872753 is an apocalyptic number.

It is an amenable number.

21872753 is a deficient number, since it is larger than the sum of its proper divisors (3749647).

21872753 is a wasteful number, since it uses less digits than its factorization.

21872753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536.

The product of its digits is 23520, while the sum is 35.

The square root of 21872753 is about 4676.8315128942. The cubic root of 21872753 is about 279.6626592151.

The spelling of 21872753 in words is "twenty-one million, eight hundred seventy-two thousand, seven hundred fifty-three".