11312232220 has 12 divisors (see below), whose sum is σ = 23755687704. Its totient is φ = 4524892880.

The previous prime is 11312232203. The next prime is 11312232233. The reversal of 11312232220 is 2223221311.

It is a super-2 number, since 2×11312232220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282805786 + ... + 282805825.

It is an arithmetic number, because the mean of its divisors is an integer number (1979640642).

Almost surely, 2^11312232220 is an apocalyptic number.

11312232220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11312232220 is an abundant number, since it is smaller than the sum of its proper divisors (12443455484).

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

11312232220 is a wasteful number, since it uses less digits than its factorization.

11312232220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565611620 (or 565611618 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 11312232220 its reverse (2223221311), we get a palindrome (13535453531).

The spelling of 11312232220 in words is "eleven billion, three hundred twelve million, two hundred thirty-two thousand, two hundred twenty".