121102111221 has 32 divisors (see below), whose sum is σ = 204102812928. Its totient is φ = 62151598080.

The previous prime is 121102111159. The next prime is 121102111241. The reversal of 121102111221 is 122111201121.

It is a happy number.

It is not a de Polignac number, because 121102111221 - 2⁷ = 121102111093 is a prime.

It is a super-2 number, since 2×121102111221² (a number of 23 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 121102111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121102111241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5984460 + ... + 6004661.

It is an arithmetic number, because the mean of its divisors is an integer number (6378212904).

Almost surely, 2^121102111221 is an apocalyptic number.

It is an amenable number.

121102111221 is a deficient number, since it is larger than the sum of its proper divisors (83000701707).

121102111221 is a wasteful number, since it uses less digits than its factorization.

121102111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11989181.

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

Adding to 121102111221 its reverse (122111201121), we get a palindrome (243213312342).

The spelling of 121102111221 in words is "one hundred twenty-one billion, one hundred two million, one hundred eleven thousand, two hundred twenty-one".