25416921 has 16 divisors (see below), whose sum is σ = 36379584. Its totient is φ = 15727104.

The previous prime is 25416883. The next prime is 25416929. The reversal of 25416921 is 12961452.

It is not a de Polignac number, because 25416921 - 2⁶ = 25416857 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (25416929) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 310 + ... + 7136.

It is an arithmetic number, because the mean of its divisors is an integer number (2273724).

Almost surely, 2^25416921 is an apocalyptic number.

It is an amenable number.

25416921 is a deficient number, since it is larger than the sum of its proper divisors (10962663).

25416921 is a wasteful number, since it uses less digits than its factorization.

25416921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6920.

The product of its digits is 4320, while the sum is 30.

The square root of 25416921 is about 5041.5197113569. The cubic root of 25416921 is about 294.0182667164.

The spelling of 25416921 in words is "twenty-five million, four hundred sixteen thousand, nine hundred twenty-one".