1121222221220 has 24 divisors (see below), whose sum is σ = 2357233255104. Its totient is φ = 447980966496.

The previous prime is 1121222221193. The next prime is 1121222221243. The reversal of 1121222221220 is 221222221211.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1121222221192 and 1121222221201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31727024 + ... + 31762343.

It is an arithmetic number, because the mean of its divisors is an integer number (98218052296).

Almost surely, 2^{1121222221220} is an apocalyptic number.

1121222221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121222221220 is an abundant number, since it is smaller than the sum of its proper divisors (1236011033884).

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

1121222221220 is a wasteful number, since it uses less digits than its factorization.

1121222221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63490259 (or 63490257 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1121222221220 its reverse (221222221211), we get a palindrome (1342444442431).

Subtracting from 1121222221220 its reverse (221222221211), we obtain a palindrome (900000000009).

The spelling of 1121222221220 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty".