11521220552 has 64 divisors (see below), whose sum is σ = 23402649600. Its totient is φ = 5297582080.

The previous prime is 11521220549. The next prime is 11521220561. The reversal of 11521220552 is 25502212511.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1085849 + ... + 1096407.

It is an arithmetic number, because the mean of its divisors is an integer number (365666400).

Almost surely, 2^11521220552 is an apocalyptic number.

It is an amenable number.

11521220552 is an abundant number, since it is smaller than the sum of its proper divisors (11881429048).

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

11521220552 is a wasteful number, since it uses less digits than its factorization.

11521220552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10766 (or 10762 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

The spelling of 11521220552 in words is "eleven billion, five hundred twenty-one million, two hundred twenty thousand, five hundred fifty-two".