1220121111013 has 24 divisors (see below), whose sum is σ = 1424270628000. Its totient is φ = 1042179858720.

The previous prime is 1220121110983. The next prime is 1220121111019. The reversal of 1220121111013 is 3101111210221.

It is a happy number.

It is not a de Polignac number, because 1220121111013 - 2²⁵ = 1220087556581 is a prime.

It is a Duffinian number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16663503 + ... + 16736563.

It is an arithmetic number, because the mean of its divisors is an integer number (59344609500).

Almost surely, 2^{1220121111013} is an apocalyptic number.

It is an amenable number.

1220121111013 is a deficient number, since it is larger than the sum of its proper divisors (204149516987).

1220121111013 is an equidigital number, since it uses as much as digits as its factorization.

1220121111013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74257 (or 74250 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1220121111013 its reverse (3101111210221), we get a palindrome (4321232321234).

The spelling of 1220121111013 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred eleven thousand, thirteen".