222002121221 has 4 divisors (see below), whose sum is σ = 222005208000. Its totient is φ = 221999034444.

The previous prime is 222002121191. The next prime is 222002121227. The reversal of 222002121221 is 122121200222.

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 222002121221 - 2¹⁸ = 222001859077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222002121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222002121227) 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 3 ways as a sum of consecutive naturals, for example, 1432871 + ... + 1580228.

It is an arithmetic number, because the mean of its divisors is an integer number (55501302000).

Almost surely, 2^222002121221 is an apocalyptic number.

It is an amenable number.

222002121221 is a deficient number, since it is larger than the sum of its proper divisors (3086779).

222002121221 is an equidigital number, since it uses as much as digits as its factorization.

222002121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3086778.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 222002121221 its reverse (122121200222), we get a palindrome (344123321443).

The spelling of 222002121221 in words is "two hundred twenty-two billion, two million, one hundred twenty-one thousand, two hundred twenty-one".