25411399921 has 2 divisors, whose sum is σ = 25411399922. Its totient is φ = 25411399920.

The previous prime is 25411399903. The next prime is 25411399939. The reversal of 25411399921 is 12999311452.

It is a balanced prime because it is at equal distance from previous prime (25411399903) and next prime (25411399939).

It can be written as a sum of positive squares in only one way, i.e., 12732639921 + 12678760000 = 112839^2 + 112600^2 .

It is a cyclic number.

It is not a de Polignac number, because 25411399921 - 2⁵ = 25411399889 is a prime.

It is not a weakly prime, because it can be changed into another prime (25411399021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12705699960 + 12705699961.

It is an arithmetic number, because the mean of its divisors is an integer number (12705699961).

Almost surely, 2^25411399921 is an apocalyptic number.

It is an amenable number.

25411399921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25411399921 is an equidigital number, since it uses as much as digits as its factorization.

25411399921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 46.

The spelling of 25411399921 in words is "twenty-five billion, four hundred eleven million, three hundred ninety-nine thousand, nine hundred twenty-one".