121120111221 has 32 divisors (see below), whose sum is σ = 166131191808. Its totient is φ = 78454059840.

The previous prime is 121120111207. The next prime is 121120111223. The reversal of 121120111221 is 122111021121.

It is a happy number.

It is not a de Polignac number, because 121120111221 - 2⁷ = 121120111093 is a prime.

It is a super-2 number, since 2×121120111221² (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 121120111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121120111223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24382480 + ... + 24387446.

It is an arithmetic number, because the mean of its divisors is an integer number (5191599744).

Almost surely, 2^121120111221 is an apocalyptic number.

It is an amenable number.

121120111221 is a deficient number, since it is larger than the sum of its proper divisors (45011080587).

121120111221 is a wasteful number, since it uses less digits than its factorization.

121120111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6241.

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

Adding to 121120111221 its reverse (122111021121), we get a palindrome (243231132342).

The spelling of 121120111221 in words is "one hundred twenty-one billion, one hundred twenty million, one hundred eleven thousand, two hundred twenty-one".