25066421 has 2 divisors, whose sum is σ = 25066422. Its totient is φ = 25066420.

The previous prime is 25066417. The next prime is 25066423. The reversal of 25066421 is 12466052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20702500 + 4363921 = 4550^2 + 2089^2 .

It is a cyclic number.

It is not a de Polignac number, because 25066421 - 2² = 25066417 is a prime.

It is a Sophie Germain prime.

Together with 25066423, it forms a pair of twin primes.

It is a Chen 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 (25066423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12533210 + 12533211.

It is an arithmetic number, because the mean of its divisors is an integer number (12533211).

Almost surely, 2^25066421 is an apocalyptic number.

It is an amenable number.

25066421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25066421 is an equidigital number, since it uses as much as digits as its factorization.

25066421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 25066421 is about 5006.6376941017. The cubic root of 25066421 is about 292.6604997349.

The spelling of 25066421 in words is "twenty-five million, sixty-six thousand, four hundred twenty-one".