25261921 has 4 divisors (see below), whose sum is σ = 25272000. Its totient is φ = 25251844.

The previous prime is 25261919. The next prime is 25261927. The reversal of 25261921 is 12916252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25261921 - 2¹ = 25261919 is a prime.

It is a super-2 number, since 2×25261921² = 1276329305220482, which contains 22 as substring.

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 25261921.

It is not an unprimeable number, because it can be changed into a prime (25261927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1980 + ... + 7378.

It is an arithmetic number, because the mean of its divisors is an integer number (6318000).

Almost surely, 2^25261921 is an apocalyptic number.

It is an amenable number.

25261921 is a deficient number, since it is larger than the sum of its proper divisors (10079).

25261921 is an equidigital number, since it uses as much as digits as its factorization.

25261921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10078.

The product of its digits is 2160, while the sum is 28.

The square root of 25261921 is about 5026.1238544230. The cubic root of 25261921 is about 293.4193771629.

The spelling of 25261921 in words is "twenty-five million, two hundred sixty-one thousand, nine hundred twenty-one".