121222110111221 has 32 divisors (see below), whose sum is σ = 142449476951040. Its totient is φ = 100991223014400.

The previous prime is 121222110111217. The next prime is 121222110111301. The reversal of 121222110111221 is 122111011222121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121222110111221 - 2² = 121222110111217 is a prime.

It is a super-2 number, since 2×121222110111221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121222110111193 and 121222110111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222110111521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2928827795 + ... + 2928869183.

It is an arithmetic number, because the mean of its divisors is an integer number (4451546154720).

Almost surely, 2^{121222110111221} is an apocalyptic number.

It is an amenable number.

121222110111221 is a deficient number, since it is larger than the sum of its proper divisors (21227366839819).

121222110111221 is a wasteful number, since it uses less digits than its factorization.

121222110111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79365.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121222110111221 its reverse (122111011222121), we get a palindrome (243333121333342).

The spelling of 121222110111221 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, one hundred ten million, one hundred eleven thousand, two hundred twenty-one".