1220111102121 has 16 divisors (see below), whose sum is σ = 1670844465600. Its totient is φ = 791394193728.

The previous prime is 1220111102113. The next prime is 1220111102201. The reversal of 1220111102121 is 1212011110221.

It is a happy number.

It is not a de Polignac number, because 1220111102121 - 2³ = 1220111102113 is a prime.

It is a super-2 number, since 2×1220111102121² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1220111102121.

It is not an unprimeable number, because it can be changed into a prime (1220118102121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3050515 + ... + 3427223.

It is an arithmetic number, because the mean of its divisors is an integer number (104427779100).

Almost surely, 2^{1220111102121} is an apocalyptic number.

It is an amenable number.

1220111102121 is a deficient number, since it is larger than the sum of its proper divisors (450733363479).

1220111102121 is a wasteful number, since it uses less digits than its factorization.

1220111102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405928.

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

Adding to 1220111102121 its reverse (1212011110221), we get a palindrome (2432122212342).

The spelling of 1220111102121 in words is "one trillion, two hundred twenty billion, one hundred eleven million, one hundred two thousand, one hundred twenty-one".