25212821129 has 2 divisors, whose sum is σ = 25212821130. Its totient is φ = 25212821128.

The previous prime is 25212821119. The next prime is 25212821173. The reversal of 25212821129 is 92112821252.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23513155600 + 1699665529 = 153340^2 + 41227^2 .

It is a cyclic number.

It is not a de Polignac number, because 25212821129 - 2¹⁶ = 25212755593 is a prime.

It is not a weakly prime, because it can be changed into another prime (25212821119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12606410564 + 12606410565.

It is an arithmetic number, because the mean of its divisors is an integer number (12606410565).

Almost surely, 2^25212821129 is an apocalyptic number.

It is an amenable number.

25212821129 is a deficient number, since it is larger than the sum of its proper divisors (1).

25212821129 is an equidigital number, since it uses as much as digits as its factorization.

25212821129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 35.

The spelling of 25212821129 in words is "twenty-five billion, two hundred twelve million, eight hundred twenty-one thousand, one hundred twenty-nine".