121222001221 has 4 divisors (see below), whose sum is σ = 121571344512. Its totient is φ = 120872657932.

The previous prime is 121222001209. The next prime is 121222001227. The reversal of 121222001221 is 122100222121.

It is a happy number.

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 121222001221 - 2⁵ = 121222001189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121222001195 and 121222001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222001227) 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, 174671125 + ... + 174671818.

It is an arithmetic number, because the mean of its divisors is an integer number (30392836128).

Almost surely, 2^121222001221 is an apocalyptic number.

It is an amenable number.

121222001221 is a deficient number, since it is larger than the sum of its proper divisors (349343291).

121222001221 is an equidigital number, since it uses as much as digits as its factorization.

121222001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349343290.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121222001221 its reverse (122100222121), we get a palindrome (243322223342).

The spelling of 121222001221 in words is "one hundred twenty-one billion, two hundred twenty-two million, one thousand, two hundred twenty-one".