222021021221 has 4 divisors (see below), whose sum is σ = 222044722944. Its totient is φ = 221997319500.

The previous prime is 222021021199. The next prime is 222021021259. The reversal of 222021021221 is 122120120222.

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 222021021221 - 2¹⁰ = 222021020197 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 222021021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222021021721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11836805 + ... + 11855546.

It is an arithmetic number, because the mean of its divisors is an integer number (55511180736).

Almost surely, 2^222021021221 is an apocalyptic number.

It is an amenable number.

222021021221 is a deficient number, since it is larger than the sum of its proper divisors (23701723).

222021021221 is an equidigital number, since it uses as much as digits as its factorization.

222021021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23701722.

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

Adding to 222021021221 its reverse (122120120222), we get a palindrome (344141141443).

Subtracting from 222021021221 its reverse (122120120222), we obtain a palindrome (99900900999).

The spelling of 222021021221 in words is "two hundred twenty-two billion, twenty-one million, twenty-one thousand, two hundred twenty-one".