11215251520 has 112 divisors (see below), whose sum is σ = 29845138176. Its totient is φ = 3978752000.

The previous prime is 11215251497. The next prime is 11215251521. The reversal of 11215251520 is 2515251211.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (11215251521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105465 + ... + 183175.

It is an arithmetic number, because the mean of its divisors is an integer number (266474448).

Almost surely, 2^11215251520 is an apocalyptic number.

11215251520 is a gapful number since it is divisible by the number (10) 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 11215251520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14922569088).

11215251520 is an abundant number, since it is smaller than the sum of its proper divisors (18629886656).

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

11215251520 is a wasteful number, since it uses less digits than its factorization.

11215251520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77780 (or 77770 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 25.

The spelling of 11215251520 in words is "eleven billion, two hundred fifteen million, two hundred fifty-one thousand, five hundred twenty".