1220121111012 has 24 divisors (see below), whose sum is σ = 2847069111936. Its totient is φ = 406689915168.

The previous prime is 1220121110983. The next prime is 1220121111019. The reversal of 1220121111012 is 2101111210221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1220121110982 and 1220121111000.

It is not an unprimeable number, because it can be changed into a prime (1220121111019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1841643 + ... + 2414930.

It is an arithmetic number, because the mean of its divisors is an integer number (118627879664).

Almost surely, 2^{1220121111012} is an apocalyptic number.

1220121111012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220121111012 is an abundant number, since it is smaller than the sum of its proper divisors (1626948000924).

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

1220121111012 is a wasteful number, since it uses less digits than its factorization.

1220121111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4280467 (or 4280465 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1220121111012 its reverse (2101111210221), we get a palindrome (3321232321233).

The spelling of 1220121111012 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred eleven thousand, twelve".