1220121112113 has 64 divisors (see below), whose sum is σ = 1874930572800. Its totient is φ = 784195872768.

The previous prime is 1220121112109. The next prime is 1220121112121. The reversal of 1220121112113 is 3112111210221.

It is a happy number.

It is not a de Polignac number, because 1220121112113 - 2² = 1220121112109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220121112213) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 759253156 + ... + 759254762.

It is an arithmetic number, because the mean of its divisors is an integer number (29295790200).

Almost surely, 2^{1220121112113} is an apocalyptic number.

It is an amenable number.

1220121112113 is a deficient number, since it is larger than the sum of its proper divisors (654809460687).

1220121112113 is an equidigital number, since it uses as much as digits as its factorization.

1220121112113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856 (or 2792 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1220121112113 its reverse (3112111210221), we get a palindrome (4332232322334).

The spelling of 1220121112113 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twelve thousand, one hundred thirteen".