25705321 has 4 divisors (see below), whose sum is σ = 25758592. Its totient is φ = 25652052.

The previous prime is 25705313. The next prime is 25705333. The reversal of 25705321 is 12350752.

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.

It is a cyclic number.

It is not a de Polignac number, because 25705321 - 2³ = 25705313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25705391) 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, 25905 + ... + 26878.

It is an arithmetic number, because the mean of its divisors is an integer number (6439648).

Almost surely, 2^25705321 is an apocalyptic number.

It is an amenable number.

25705321 is a deficient number, since it is larger than the sum of its proper divisors (53271).

25705321 is an equidigital number, since it uses as much as digits as its factorization.

25705321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53270.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 25705321 is about 5070.0415185677. The cubic root of 25705321 is about 295.1261396785.

The spelling of 25705321 in words is "twenty-five million, seven hundred five thousand, three hundred twenty-one".