25366421 has 2 divisors, whose sum is σ = 25366422. Its totient is φ = 25366420.

The previous prime is 25366409. The next prime is 25366427. The reversal of 25366421 is 12466352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23902321 + 1464100 = 4889^2 + 1210^2 .

It is a cyclic number.

It is not a de Polignac number, because 25366421 - 2⁶ = 25366357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25366427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12683210 + 12683211.

It is an arithmetic number, because the mean of its divisors is an integer number (12683211).

Almost surely, 2^25366421 is an apocalyptic number.

It is an amenable number.

25366421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25366421 is an equidigital number, since it uses as much as digits as its factorization.

25366421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 25366421 is about 5036.5088106743. The cubic root of 25366421 is about 293.8234127063.

The spelling of 25366421 in words is "twenty-five million, three hundred sixty-six thousand, four hundred twenty-one".