25067921 has 2 divisors, whose sum is σ = 25067922. Its totient is φ = 25067920.

The previous prime is 25067891. The next prime is 25067923. The reversal of 25067921 is 12976052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20611600 + 4456321 = 4540^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 25067921 - 2¹⁰ = 25066897 is a prime.

It is a Sophie Germain prime.

Together with 25067923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25067923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12533960 + 12533961.

It is an arithmetic number, because the mean of its divisors is an integer number (12533961).

Almost surely, 2^25067921 is an apocalyptic number.

It is an amenable number.

25067921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25067921 is an equidigital number, since it uses as much as digits as its factorization.

25067921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 25067921 is about 5006.7874929939. The cubic root of 25067921 is about 292.6663373186. Note that the first 3 decimals are identical.

The spelling of 25067921 in words is "twenty-five million, sixty-seven thousand, nine hundred twenty-one".