21792125 has 8 divisors (see below), whose sum is σ = 27196728. Its totient is φ = 17433600.

The previous prime is 21792119. The next prime is 21792139. The reversal of 21792125 is 52129712.

It can be written as a sum of positive squares in 4 ways, for example, as 11236 + 21780889 = 106^2 + 4667^2 .

It is not a de Polignac number, because 21792125 - 2⁶ = 21792061 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87044 + ... + 87293.

It is an arithmetic number, because the mean of its divisors is an integer number (3399591).

Almost surely, 2^21792125 is an apocalyptic number.

21792125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21792125 is a deficient number, since it is larger than the sum of its proper divisors (5404603).

21792125 is an equidigital number, since it uses as much as digits as its factorization.

21792125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174352 (or 174342 counting only the distinct ones).

The product of its digits is 2520, while the sum is 29.

The square root of 21792125 is about 4668.2036159534. The cubic root of 21792125 is about 279.3186024753.

The spelling of 21792125 in words is "twenty-one million, seven hundred ninety-two thousand, one hundred twenty-five".