11521252420 has 12 divisors (see below), whose sum is σ = 24194630124. Its totient is φ = 4608500960.

The previous prime is 11521252411. The next prime is 11521252447. The reversal of 11521252420 is 2425212511.

It can be written as a sum of positive squares in 2 ways, for example, as 6274857796 + 5246394624 = 79214^2 + 72432^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288031291 + ... + 288031330.

It is an arithmetic number, because the mean of its divisors is an integer number (2016219177).

Almost surely, 2^11521252420 is an apocalyptic number.

11521252420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11521252420 is an abundant number, since it is smaller than the sum of its proper divisors (12673377704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11521252420 is a wasteful number, since it uses less digits than its factorization.

11521252420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576062630 (or 576062628 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 11521252420 its reverse (2425212511), we get a palindrome (13946464931).

The spelling of 11521252420 in words is "eleven billion, five hundred twenty-one million, two hundred fifty-two thousand, four hundred twenty".