21468725 has 6 divisors (see below), whose sum is σ = 26621250. Its totient is φ = 17174960.

The previous prime is 21468701. The next prime is 21468731. The reversal of 21468725 is 52786412.

It can be written as a sum of positive squares in 3 ways, for example, as 3845521 + 17623204 = 1961^2 + 4198^2 .

It is not a de Polignac number, because 21468725 - 2²² = 17274421 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 429350 + ... + 429399.

It is an arithmetic number, because the mean of its divisors is an integer number (4436875).

Almost surely, 2^21468725 is an apocalyptic number.

21468725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21468725 is a deficient number, since it is larger than the sum of its proper divisors (5152525).

21468725 is an equidigital number, since it uses as much as digits as its factorization.

21468725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858759 (or 858754 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 21468725 is about 4633.4355504312. The cubic root of 21468725 is about 277.9299937590.

The spelling of 21468725 in words is "twenty-one million, four hundred sixty-eight thousand, seven hundred twenty-five".