11321231520 has 96 divisors (see below), whose sum is σ = 36266408640. Its totient is φ = 2967818240.

The previous prime is 11321231443. The next prime is 11321231521. The reversal of 11321231520 is 2513212311.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (11321231521) 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, 171561 + ... + 228200.

It is an arithmetic number, because the mean of its divisors is an integer number (377775090).

Almost surely, 2^11321231520 is an apocalyptic number.

11321231520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11321231520 is an abundant number, since it is smaller than the sum of its proper divisors (24945177120).

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

11321231520 is a wasteful number, since it uses less digits than its factorization.

11321231520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399838 (or 399830 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 11321231520 its reverse (2513212311), we get a palindrome (13834443831).

The spelling of 11321231520 in words is "eleven billion, three hundred twenty-one million, two hundred thirty-one thousand, five hundred twenty".