121220222221 has 4 divisors (see below), whose sum is σ = 138537396832. Its totient is φ = 103903047612.

The previous prime is 121220222213. The next prime is 121220222237. The reversal of 121220222221 is 122222022121.

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 not a de Polignac number, because 121220222221 - 2³ = 121220222213 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 (121220222521) 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, 8658587295 + ... + 8658587308.

It is an arithmetic number, because the mean of its divisors is an integer number (34634349208).

Almost surely, 2^121220222221 is an apocalyptic number.

It is an amenable number.

121220222221 is a deficient number, since it is larger than the sum of its proper divisors (17317174611).

121220222221 is an equidigital number, since it uses as much as digits as its factorization.

121220222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17317174610.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 121220222221 its reverse (122222022121), we get a palindrome (243442244342).

The spelling of 121220222221 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".