25921971 has 16 divisors (see below), whose sum is σ = 38684800. Its totient is φ = 17154504.

The previous prime is 25921967. The next prime is 25921997. The reversal of 25921971 is 17912952.

It is not a de Polignac number, because 25921971 - 2² = 25921967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25921901) 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, 300 + ... + 7206.

It is an arithmetic number, because the mean of its divisors is an integer number (2417800).

Almost surely, 2^25921971 is an apocalyptic number.

25921971 is a deficient number, since it is larger than the sum of its proper divisors (12762829).

25921971 is a wasteful number, since it uses less digits than its factorization.

25921971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7055 (or 7049 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 25921971 is about 5091.3623913448. The cubic root of 25921971 is about 295.9529501246.

The spelling of 25921971 in words is "twenty-five million, nine hundred twenty-one thousand, nine hundred seventy-one".