11121421220 has 72 divisors (see below), whose sum is σ = 29257926264. Its totient is φ = 3519742464.

The previous prime is 11121421159. The next prime is 11121421231. The reversal of 11121421220 is 2212412111.

It can be written as a sum of positive squares in 4 ways, for example, as 972067684 + 10149353536 = 31178^2 + 100744^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 423737 + ... + 449216.

It is an arithmetic number, because the mean of its divisors is an integer number (406360087).

Almost surely, 2^11121421220 is an apocalyptic number.

11121421220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11121421220 is an abundant number, since it is smaller than the sum of its proper divisors (18136505044).

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

11121421220 is a wasteful number, since it uses less digits than its factorization.

11121421220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872989 (or 872980 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11121421220 its reverse (2212412111), we get a palindrome (13333833331).

The spelling of 11121421220 in words is "eleven billion, one hundred twenty-one million, four hundred twenty-one thousand, two hundred twenty".