11172201220 has 12 divisors (see below), whose sum is σ = 23461622604. Its totient is φ = 4468880480.

The previous prime is 11172201203. The next prime is 11172201277. The reversal of 11172201220 is 2210227111.

It can be written as a sum of positive squares in 2 ways, for example, as 1331958016 + 9840243204 = 36496^2 + 99198^2 .

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, 279305011 + ... + 279305050.

It is an arithmetic number, because the mean of its divisors is an integer number (1955135217).

Almost surely, 2^11172201220 is an apocalyptic number.

11172201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11172201220 is an abundant number, since it is smaller than the sum of its proper divisors (12289421384).

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

11172201220 is a wasteful number, since it uses less digits than its factorization.

11172201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558610070 (or 558610068 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 11172201220 its reverse (2210227111), we get a palindrome (13382428331).

The spelling of 11172201220 in words is "eleven billion, one hundred seventy-two million, two hundred one thousand, two hundred twenty".