1121220021220 has 48 divisors (see below), whose sum is σ = 2583525294000. Its totient is φ = 406177814016.

The previous prime is 1121220021191. The next prime is 1121220021223. The reversal of 1121220021220 is 221200221211.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 590295616 + 1120629725604 = 24296^2 + 1058598^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1121220021194 and 1121220021203.

It is not an unprimeable number, because it can be changed into a prime (1121220021223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40669095 + ... + 40696654.

It is an arithmetic number, because the mean of its divisors is an integer number (53823443625).

Almost surely, 2^{1121220021220} is an apocalyptic number.

1121220021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121220021220 is an abundant number, since it is smaller than the sum of its proper divisors (1462305272780).

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

1121220021220 is a wasteful number, since it uses less digits than its factorization.

1121220021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81365824 (or 81365822 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1121220021220 its reverse (221200221211), we get a palindrome (1342420242431).

The spelling of 1121220021220 in words is "one trillion, one hundred twenty-one billion, two hundred twenty million, twenty-one thousand, two hundred twenty".