1221112111102 has 16 divisors (see below), whose sum is σ = 2020677078672. Its totient is φ = 549844102080.

The previous prime is 1221112111039. The next prime is 1221112111171. The reversal of 1221112111102 is 2011112111221.

It is a super-2 number, since 2×1221112111102² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572753208 + ... + 572755339.

It is an arithmetic number, because the mean of its divisors is an integer number (126292317417).

Almost surely, 2^{1221112111102} is an apocalyptic number.

1221112111102 is a deficient number, since it is larger than the sum of its proper divisors (799564967570).

1221112111102 is a wasteful number, since it uses less digits than its factorization.

1221112111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145508603.

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

Adding to 1221112111102 its reverse (2011112111221), we get a palindrome (3232224222323).

The spelling of 1221112111102 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, one hundred eleven thousand, one hundred two".