121222201220221 has 16 divisors (see below), whose sum is σ = 124629307614720. Its totient is φ = 117849692419200.

The previous prime is 121222201220179. The next prime is 121222201220233. The reversal of 121222201220221 is 122022102222121.

It is not a de Polignac number, because 121222201220221 - 2³³ = 121213611285629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121222201220192 and 121222201220201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222201220261) 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, 111142795 + ... + 112228183.

It is an arithmetic number, because the mean of its divisors is an integer number (7789331725920).

Almost surely, 2^{121222201220221} is an apocalyptic number.

It is an amenable number.

121222201220221 is a deficient number, since it is larger than the sum of its proper divisors (3407106394499).

121222201220221 is a wasteful number, since it uses less digits than its factorization.

121222201220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101324.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 121222201220221 its reverse (122022102222121), we get a palindrome (243244303442342).

The spelling of 121222201220221 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, two hundred one million, two hundred twenty thousand, two hundred twenty-one".