1220221111113 has 12 divisors (see below), whose sum is σ = 1810177865028. Its totient is φ = 791494774560.

The previous prime is 1220221111097. The next prime is 1220221111133. The reversal of 1220221111113 is 3111111220221.

It is a happy number.

1220221111113 is a `hidden beast` number, since 1 + 220 + 221 + 111 + 113 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 428642565264 + 791578545849 = 654708^2 + 889707^2 .

It is not a de Polignac number, because 1220221111113 - 2⁴ = 1220221111097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1220221111133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1832163498 + ... + 1832164163.

It is an arithmetic number, because the mean of its divisors is an integer number (150848155419).

Almost surely, 2^{1220221111113} is an apocalyptic number.

It is an amenable number.

1220221111113 is a deficient number, since it is larger than the sum of its proper divisors (589956753915).

1220221111113 is a wasteful number, since it uses less digits than its factorization.

1220221111113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3664327704 (or 3664327701 counting only the distinct ones).

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

Adding to 1220221111113 its reverse (3111111220221), we get a palindrome (4331332331334).

The spelling of 1220221111113 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred eleven thousand, one hundred thirteen".