11312211220 has 12 divisors (see below), whose sum is σ = 23755643604. Its totient is φ = 4524884480.

The previous prime is 11312211199. The next prime is 11312211227. The reversal of 11312211220 is 2211221311.

It can be written as a sum of positive squares in 2 ways, for example, as 6283415824 + 5028795396 = 79268^2 + 70914^2 .

It is a super-2 number, since 2×11312211220² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11312211194 and 11312211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11312211227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282805261 + ... + 282805300.

It is an arithmetic number, because the mean of its divisors is an integer number (1979636967).

Almost surely, 2^11312211220 is an apocalyptic number.

11312211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11312211220 is an abundant number, since it is smaller than the sum of its proper divisors (12443432384).

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

11312211220 is a wasteful number, since it uses less digits than its factorization.

11312211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565610570 (or 565610568 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11312211220 its reverse (2211221311), we get a palindrome (13523432531).

The spelling of 11312211220 in words is "eleven billion, three hundred twelve million, two hundred eleven thousand, two hundred twenty".