21725463 has 8 divisors (see below), whose sum is σ = 28990576. Its totient is φ = 14472000.

The previous prime is 21725447. The next prime is 21725467. The reversal of 21725463 is 36452712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21725463 - 2⁴ = 21725447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21725463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21725467) 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 7 ways as a sum of consecutive naturals, for example, 3393 + ... + 7413.

It is an arithmetic number, because the mean of its divisors is an integer number (3623822).

Almost surely, 2^21725463 is an apocalyptic number.

21725463 is a deficient number, since it is larger than the sum of its proper divisors (7265113).

21725463 is a wasteful number, since it uses less digits than its factorization.

21725463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5825.

The product of its digits is 10080, while the sum is 30.

The square root of 21725463 is about 4661.0581416670. The cubic root of 21725463 is about 279.0335001718.

The spelling of 21725463 in words is "twenty-one million, seven hundred twenty-five thousand, four hundred sixty-three".