121111201221 has 4 divisors (see below), whose sum is σ = 161481601632. Its totient is φ = 80740800812.

The previous prime is 121111201207. The next prime is 121111201229. The reversal of 121111201221 is 122102111121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121111201221 - 2⁷ = 121111201093 is a prime.

It is a super-2 number, since 2×121111201221² (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 121111201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111201229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20185200201 + ... + 20185200206.

It is an arithmetic number, because the mean of its divisors is an integer number (40370400408).

Almost surely, 2^121111201221 is an apocalyptic number.

It is an amenable number.

121111201221 is a deficient number, since it is larger than the sum of its proper divisors (40370400411).

121111201221 is an equidigital number, since it uses as much as digits as its factorization.

121111201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40370400410.

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

Adding to 121111201221 its reverse (122102111121), we get a palindrome (243213312342).

The spelling of 121111201221 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred one thousand, two hundred twenty-one".