121110121221 has 32 divisors (see below), whose sum is σ = 170061534720. Its totient is φ = 76591308864.

The previous prime is 121110121213. The next prime is 121110121259. The reversal of 121110121221 is 122121011121.

It is a happy number.

It is not a de Polignac number, because 121110121221 - 2³ = 121110121213 is a prime.

It is a super-2 number, since 2×121110121221² (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 121110121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121110123221) 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, 535855 + ... + 727571.

It is an arithmetic number, because the mean of its divisors is an integer number (5314422960).

Almost surely, 2^121110121221 is an apocalyptic number.

It is an amenable number.

121110121221 is a deficient number, since it is larger than the sum of its proper divisors (48951413499).

121110121221 is a wasteful number, since it uses less digits than its factorization.

121110121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191905.

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

Adding to 121110121221 its reverse (122121011121), we get a palindrome (243231132342).

The spelling of 121110121221 in words is "one hundred twenty-one billion, one hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".