11525424121 has 4 divisors (see below), whose sum is σ = 11533357732. Its totient is φ = 11517490512.

The previous prime is 11525424077. The next prime is 11525424133. The reversal of 11525424121 is 12142452511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4872738025 + 6652686096 = 69805^2 + 81564^2 .

It is a cyclic number.

It is not a de Polignac number, because 11525424121 - 2²⁵ = 11491869689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11525424121.

It is not an unprimeable number, because it can be changed into a prime (11525424161) 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 in 3 ways as a sum of consecutive naturals, for example, 3964626 + ... + 3967531.

It is an arithmetic number, because the mean of its divisors is an integer number (2883339433).

Almost surely, 2^11525424121 is an apocalyptic number.

It is an amenable number.

11525424121 is a deficient number, since it is larger than the sum of its proper divisors (7933611).

11525424121 is an equidigital number, since it uses as much as digits as its factorization.

11525424121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7933610.

The product of its digits is 3200, while the sum is 28.

Adding to 11525424121 its reverse (12142452511), we get a palindrome (23667876632).

The spelling of 11525424121 in words is "eleven billion, five hundred twenty-five million, four hundred twenty-four thousand, one hundred twenty-one".