25421899 has 2 divisors, whose sum is σ = 25421900. Its totient is φ = 25421898.

The previous prime is 25421839. The next prime is 25421939. The reversal of 25421899 is 99812452.

It is an a-pointer prime, because the next prime (25421939) can be obtained adding 25421899 to its sum of digits (40).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25421899 - 2⁷ = 25421771 is a prime.

It is not a weakly prime, because it can be changed into another prime (25421819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12710949 + 12710950.

It is an arithmetic number, because the mean of its divisors is an integer number (12710950).

Almost surely, 2^25421899 is an apocalyptic number.

25421899 is a deficient number, since it is larger than the sum of its proper divisors (1).

25421899 is an equidigital number, since it uses as much as digits as its factorization.

25421899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 25421899 is about 5042.0133875269. The cubic root of 25421899 is about 294.0374603262.

The spelling of 25421899 in words is "twenty-five million, four hundred twenty-one thousand, eight hundred ninety-nine".