121121101221 has 16 divisors (see below), whose sum is σ = 161799933120. Its totient is φ = 80594974080.

The previous prime is 121121101193. The next prime is 121121101261. The reversal of 121121101221 is 122101121121.

It is a happy number.

It is not a de Polignac number, because 121121101221 - 2⁷ = 121121101093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121121101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121101261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3717361 + ... + 3749801.

It is an arithmetic number, because the mean of its divisors is an integer number (10112495820).

Almost surely, 2^121121101221 is an apocalyptic number.

It is an amenable number.

121121101221 is a deficient number, since it is larger than the sum of its proper divisors (40678831899).

121121101221 is a wasteful number, since it uses less digits than its factorization.

121121101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34756.

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

Adding to 121121101221 its reverse (122101121121), we get a palindrome (243222222342).

The spelling of 121121101221 in words is "one hundred twenty-one billion, one hundred twenty-one million, one hundred one thousand, two hundred twenty-one".