11131231220 has 24 divisors (see below), whose sum is σ = 23412657408. Its totient is φ = 4445431200.

The previous prime is 11131231201. The next prime is 11131231259. The reversal of 11131231220 is 2213213111.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428396 + ... + 453635.

It is an arithmetic number, because the mean of its divisors is an integer number (975527392).

Almost surely, 2^11131231220 is an apocalyptic number.

11131231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11131231220 is an abundant number, since it is smaller than the sum of its proper divisors (12281426188).

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

11131231220 is a wasteful number, since it uses less digits than its factorization.

11131231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882671 (or 882669 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11131231220 its reverse (2213213111), we get a palindrome (13344444331).

The spelling of 11131231220 in words is "eleven billion, one hundred thirty-one million, two hundred thirty-one thousand, two hundred twenty".