11521351872 has 140 divisors (see below), whose sum is σ = 35255094336. Its totient is φ = 3716513280.

The previous prime is 11521351871. The next prime is 11521351901. The reversal of 11521351872 is 27815312511.

11521351872 is a `hidden beast` number, since 1 + 1 + 521 + 3 + 51 + 87 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (11521351871) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 124858 + ... + 196550.

Almost surely, 2^11521351872 is an apocalyptic number.

11521351872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11521351872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17627547168).

11521351872 is an abundant number, since it is smaller than the sum of its proper divisors (23733742464).

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

11521351872 is an equidigital number, since it uses as much as digits as its factorization.

11521351872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71748 (or 71729 counting only the distinct ones).

The product of its digits is 16800, while the sum is 36.

The spelling of 11521351872 in words is "eleven billion, five hundred twenty-one million, three hundred fifty-one thousand, eight hundred seventy-two".