25122404521 has 2 divisors, whose sum is σ = 25122404522. Its totient is φ = 25122404520.

The previous prime is 25122404509. The next prime is 25122404533. The reversal of 25122404521 is 12540422152.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (25122404509) and next prime (25122404533).

It can be written as a sum of positive squares in only one way, i.e., 24688265625 + 434138896 = 157125^2 + 20836^2 .

It is a cyclic number.

It is not a de Polignac number, because 25122404521 - 2²⁵ = 25088850089 is a prime.

It is a super-2 number, since 2×25122404521² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25122404521.

It is not a weakly prime, because it can be changed into another prime (25122404501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12561202260 + 12561202261.

It is an arithmetic number, because the mean of its divisors is an integer number (12561202261).

Almost surely, 2^25122404521 is an apocalyptic number.

It is an amenable number.

25122404521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25122404521 is an equidigital number, since it uses as much as digits as its factorization.

25122404521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 25122404521 its reverse (12540422152), we get a palindrome (37662826673).

The spelling of 25122404521 in words is "twenty-five billion, one hundred twenty-two million, four hundred four thousand, five hundred twenty-one".