11121201220 has 48 divisors (see below), whose sum is σ = 24813552960. Its totient is φ = 4174948224.

The previous prime is 11121201193. The next prime is 11121201263. The reversal of 11121201220 is 2210212111.

It is a super-2 number, since 2×11121201220² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11121201220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96099 + ... + 177418.

It is an arithmetic number, because the mean of its divisors is an integer number (516949020).

Almost surely, 2^11121201220 is an apocalyptic number.

11121201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11121201220 is an abundant number, since it is smaller than the sum of its proper divisors (13692351740).

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

11121201220 is a wasteful number, since it uses less digits than its factorization.

11121201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273652 (or 273650 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11121201220 its reverse (2210212111), we get a palindrome (13331413331).

The spelling of 11121201220 in words is "eleven billion, one hundred twenty-one million, two hundred one thousand, two hundred twenty".