1220121222112 has 96 divisors (see below), whose sum is σ = 2626646436288. Its totient is φ = 554504196096.

The previous prime is 1220121222091. The next prime is 1220121222127. The reversal of 1220121222112 is 2112221210221.

It is a self number, because there is not a number n which added to its sum of digits gives 1220121222112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18582813 + ... + 18648355.

It is an arithmetic number, because the mean of its divisors is an integer number (27360900378).

Almost surely, 2^{1220121222112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220121222112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1313323218144).

1220121222112 is an abundant number, since it is smaller than the sum of its proper divisors (1406525214176).

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

1220121222112 is a wasteful number, since it uses less digits than its factorization.

1220121222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66252 (or 66244 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1220121222112 its reverse (2112221210221), we get a palindrome (3332342432333).

The spelling of 1220121222112 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twelve".