1121222212220 has 96 divisors (see below), whose sum is σ = 2704285785600. Its totient is φ = 386190201600.

The previous prime is 1121222212219. The next prime is 1121222212247. The reversal of 1121222212220 is 222122221211.

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 = 1121222212192 and 1121222212201.

It is a congruent number.

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, 27488201 + ... + 27528959.

It is an arithmetic number, because the mean of its divisors is an integer number (28169643600).

Almost surely, 2^{1121222212220} is an apocalyptic number.

1121222212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121222212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1352142892800).

1121222212220 is an abundant number, since it is smaller than the sum of its proper divisors (1583063573380).

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

1121222212220 is a wasteful number, since it uses less digits than its factorization.

1121222212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47379 (or 47377 counting only the distinct ones).

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

Adding to 1121222212220 its reverse (222122221211), we get a palindrome (1343344433431).

The spelling of 1121222212220 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty".