121112222123221 has 4 divisors (see below), whose sum is σ = 138413968140832. Its totient is φ = 103810476105612.

The previous prime is 121112222123183. The next prime is 121112222123227. The reversal of 121112222123221 is 122321222211121.

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 121112222123221 - 2¹³ = 121112222115029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112222123227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8650873008795 + ... + 8650873008808.

It is an arithmetic number, because the mean of its divisors is an integer number (34603492035208).

Almost surely, 2^{121112222123221} is an apocalyptic number.

It is an amenable number.

121112222123221 is a deficient number, since it is larger than the sum of its proper divisors (17301746017611).

121112222123221 is an equidigital number, since it uses as much as digits as its factorization.

121112222123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17301746017610.

The product of its digits is 768, while the sum is 25.

Adding to 121112222123221 its reverse (122321222211121), we get a palindrome (243433444334342).

The spelling of 121112222123221 in words is "one hundred twenty-one trillion, one hundred twelve billion, two hundred twenty-two million, one hundred twenty-three thousand, two hundred twenty-one".