25668921 has 8 divisors (see below), whose sum is σ = 34249024. Its totient is φ = 17100720.

The previous prime is 25668919. The next prime is 25668931. The reversal of 25668921 is 12986652.

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

It is not a de Polignac number, because 25668921 - 2¹ = 25668919 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 25668921.

It is not an unprimeable number, because it can be changed into a prime (25668901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5556 + ... + 9066.

It is an arithmetic number, because the mean of its divisors is an integer number (4281128).

Almost surely, 2^25668921 is an apocalyptic number.

It is an amenable number.

25668921 is a deficient number, since it is larger than the sum of its proper divisors (8580103).

25668921 is a wasteful number, since it uses less digits than its factorization.

25668921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5951.

The product of its digits is 51840, while the sum is 39.

The square root of 25668921 is about 5066.4505326708. The cubic root of 25668921 is about 294.9867694919.

The spelling of 25668921 in words is "twenty-five million, six hundred sixty-eight thousand, nine hundred twenty-one".