25424921 has 2 divisors, whose sum is σ = 25424922. Its totient is φ = 25424920.

The previous prime is 25424891. The next prime is 25424923. The reversal of 25424921 is 12942452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23629321 + 1795600 = 4861^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 25424921 - 2⁶ = 25424857 is a prime.

Together with 25424923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25424923) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12712460 + 12712461.

It is an arithmetic number, because the mean of its divisors is an integer number (12712461).

Almost surely, 2^25424921 is an apocalyptic number.

It is an amenable number.

25424921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25424921 is an equidigital number, since it uses as much as digits as its factorization.

25424921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

The square root of 25424921 is about 5042.3130604912. The cubic root of 25424921 is about 294.0491109900.

The spelling of 25424921 in words is "twenty-five million, four hundred twenty-four thousand, nine hundred twenty-one".