121222120221 has 6 divisors (see below), whose sum is σ = 175098618110. Its totient is φ = 80814746808.

The previous prime is 121222120211. The next prime is 121222120231. The reversal of 121222120221 is 122021222121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121222120211) and next prime (121222120231).

It can be written as a sum of positive squares in only one way, i.e., 121124880900 + 97239321 = 348030^2 + 9861^2 .

It is not a de Polignac number, because 121222120221 - 2⁵ = 121222120189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121222120194 and 121222120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222120211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6734562226 + ... + 6734562243.

Almost surely, 2^121222120221 is an apocalyptic number.

It is an amenable number.

121222120221 is a deficient number, since it is larger than the sum of its proper divisors (53876497889).

121222120221 is a wasteful number, since it uses less digits than its factorization.

121222120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13469124475 (or 13469124472 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121222120221 its reverse (122021222121), we get a palindrome (243243342342).

The spelling of 121222120221 in words is "one hundred twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, two hundred twenty-one".