121110110111221 has 24 divisors (see below), whose sum is σ = 153692220537504. Its totient is φ = 94370612626080.

The previous prime is 121110110111173. The next prime is 121110110111261. The reversal of 121110110111221 is 122111011011121.

It is not a de Polignac number, because 121110110111221 - 2⁷ = 121110110111093 is a prime.

It is a super-2 number, since 2×121110110111221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121110110111195 and 121110110111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121110110111261) 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, 58445751 + ... + 60482443.

It is an arithmetic number, because the mean of its divisors is an integer number (6403842522396).

Almost surely, 2^{121110110111221} is an apocalyptic number.

121110110111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121110110111221 is a deficient number, since it is larger than the sum of its proper divisors (32582110426283).

121110110111221 is a wasteful number, since it uses less digits than its factorization.

121110110111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147041 (or 2147034 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 121110110111221 its reverse (122111011011121), we get a palindrome (243221121122342).

The spelling of 121110110111221 in words is "one hundred twenty-one trillion, one hundred ten billion, one hundred ten million, one hundred eleven thousand, two hundred twenty-one".