21882725 has 24 divisors (see below), whose sum is σ = 28597128. Its totient is φ = 16588800.

The previous prime is 21882703. The next prime is 21882739. The reversal of 21882725 is 52728812.

It can be written as a sum of positive squares in 12 ways, for example, as 1216609 + 20666116 = 1103^2 + 4546^2 .

It is not a de Polignac number, because 21882725 - 2¹⁰ = 21881701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37637 + ... + 38213.

It is an arithmetic number, because the mean of its divisors is an integer number (1191547).

Almost surely, 2^21882725 is an apocalyptic number.

21882725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21882725 is a deficient number, since it is larger than the sum of its proper divisors (6714403).

21882725 is a wasteful number, since it uses less digits than its factorization.

21882725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 660 counting only the distinct ones).

The product of its digits is 17920, while the sum is 35.

The square root of 21882725 is about 4677.8974978082. The cubic root of 21882725 is about 279.7051530632.

It can be divided in two parts, 2188 and 2725, that added together give a cube (4913 = 17³).

The spelling of 21882725 in words is "twenty-one million, eight hundred eighty-two thousand, seven hundred twenty-five".