25625021 has 4 divisors (see below), whose sum is σ = 26007552. Its totient is φ = 25242492.

The previous prime is 25624961. The next prime is 25625029. The reversal of 25625021 is 12052652.

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 25625021 - 2⁶ = 25624957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25625029) 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, 191165 + ... + 191298.

It is an arithmetic number, because the mean of its divisors is an integer number (6501888).

Almost surely, 2^25625021 is an apocalyptic number.

It is an amenable number.

25625021 is a deficient number, since it is larger than the sum of its proper divisors (382531).

25625021 is an equidigital number, since it uses as much as digits as its factorization.

25625021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382530.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 25625021 is about 5062.1162570609. The cubic root of 25625021 is about 294.8185075343.

Adding to 25625021 its reverse (12052652), we get a palindrome (37677673).

The spelling of 25625021 in words is "twenty-five million, six hundred twenty-five thousand, twenty-one".