1221112111101 has 16 divisors (see below), whose sum is σ = 1722721583040. Its totient is φ = 767232691200.

The previous prime is 1221112111039. The next prime is 1221112111171. The reversal of 1221112111101 is 1011112111221.

It is not a de Polignac number, because 1221112111101 - 2¹⁷ = 1221111980029 is a prime.

It is a super-2 number, since 2×1221112111101² (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 (1221112111171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55489050 + ... + 55511051.

It is an arithmetic number, because the mean of its divisors is an integer number (107670098940).

Almost surely, 2^{1221112111101} is an apocalyptic number.

It is an amenable number.

1221112111101 is a deficient number, since it is larger than the sum of its proper divisors (501609471939).

1221112111101 is a wasteful number, since it uses less digits than its factorization.

1221112111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111000316.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1221112111101 its reverse (1011112111221), we get a palindrome (2232224222322).

The spelling of 1221112111101 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, one hundred eleven thousand, one hundred one".