11321201220 has 96 divisors (see below), whose sum is σ = 37802999808. Its totient is φ = 2475192192.

The previous prime is 11321201189. The next prime is 11321201257. The reversal of 11321201220 is 2210212311.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 11321201220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 576324 + ... + 595643.

It is an arithmetic number, because the mean of its divisors is an integer number (393781248).

Almost surely, 2^11321201220 is an apocalyptic number.

11321201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11321201220 is an abundant number, since it is smaller than the sum of its proper divisors (26481798588).

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

11321201220 is a wasteful number, since it uses less digits than its factorization.

11321201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172009 (or 1172007 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 11321201220 its reverse (2210212311), we get a palindrome (13531413531).

The spelling of 11321201220 in words is "eleven billion, three hundred twenty-one million, two hundred one thousand, two hundred twenty".