25355021 has 2 divisors, whose sum is σ = 25355022. Its totient is φ = 25355020.

The previous prime is 25355003. The next prime is 25355051. The reversal of 25355021 is 12055352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22905796 + 2449225 = 4786^2 + 1565^2 .

It is a cyclic number.

It is not a de Polignac number, because 25355021 - 2⁶ = 25354957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25355051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12677510 + 12677511.

It is an arithmetic number, because the mean of its divisors is an integer number (12677511).

Almost surely, 2^25355021 is an apocalyptic number.

It is an amenable number.

25355021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25355021 is an equidigital number, since it uses as much as digits as its factorization.

25355021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 25355021 is about 5035.3769471610. The cubic root of 25355021 is about 293.7793900879.

The spelling of 25355021 in words is "twenty-five million, three hundred fifty-five thousand, twenty-one".