1221110122111 has 24 divisors (see below), whose sum is σ = 1423343526192. Its totient is φ = 1043198956800.

The previous prime is 1221110122109. The next prime is 1221110122159. The reversal of 1221110122111 is 1112210111221.

It is not a de Polignac number, because 1221110122111 - 2¹ = 1221110122109 is a prime.

It is a super-2 number, since 2×1221110122111² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221110122411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 888676 + ... + 1797766.

It is an arithmetic number, because the mean of its divisors is an integer number (59305980258).

Almost surely, 2^{1221110122111} is an apocalyptic number.

1221110122111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221110122111 is a deficient number, since it is larger than the sum of its proper divisors (202233404081).

1221110122111 is a wasteful number, since it uses less digits than its factorization.

1221110122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909783 (or 909772 counting only the distinct ones).

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

Adding to 1221110122111 its reverse (1112210111221), we get a palindrome (2333320233332).

The spelling of 1221110122111 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, one hundred twenty-two thousand, one hundred eleven".