25367721 has 16 divisors (see below), whose sum is σ = 35808960. Its totient is φ = 15946560.

The previous prime is 25367677. The next prime is 25367737. The reversal of 25367721 is 12776352.

It is not a de Polignac number, because 25367721 - 2⁷ = 25367593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25267721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351 + ... + 7131.

It is an arithmetic number, because the mean of its divisors is an integer number (2238060).

Almost surely, 2^25367721 is an apocalyptic number.

It is an amenable number.

25367721 is a deficient number, since it is larger than the sum of its proper divisors (10441239).

25367721 is a wasteful number, since it uses less digits than its factorization.

25367721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6856.

The product of its digits is 17640, while the sum is 33.

The square root of 25367721 is about 5036.6378666726. The cubic root of 25367721 is about 293.8284319916.

The spelling of 25367721 in words is "twenty-five million, three hundred sixty-seven thousand, seven hundred twenty-one".