221222422121 has 8 divisors (see below), whose sum is σ = 224122762080. Its totient is φ = 218327677792.

The previous prime is 221222422051. The next prime is 221222422123. The reversal of 221222422121 is 121224222122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221222422121 - 2¹⁰ = 221222421097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221222422123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1319291 + ... + 1477488.

It is an arithmetic number, because the mean of its divisors is an integer number (28015345260).

Almost surely, 2^221222422121 is an apocalyptic number.

It is an amenable number.

221222422121 is a deficient number, since it is larger than the sum of its proper divisors (2900339959).

221222422121 is an equidigital number, since it uses as much as digits as its factorization.

221222422121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797815.

The product of its digits is 1024, while the sum is 23.

Adding to 221222422121 its reverse (121224222122), we get a palindrome (342446644243).

The spelling of 221222422121 in words is "two hundred twenty-one billion, two hundred twenty-two million, four hundred twenty-two thousand, one hundred twenty-one".