222212202221 has 4 divisors (see below), whose sum is σ = 235283508252. Its totient is φ = 209140896192.

The previous prime is 222212202181. The next prime is 222212202227. The reversal of 222212202221 is 122202212222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61201812100 + 161010390121 = 247390^2 + 401261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222212202221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222212202193 and 222212202202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222212202227) 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, 6535652990 + ... + 6535653023.

It is an arithmetic number, because the mean of its divisors is an integer number (58820877063).

Almost surely, 2^222212202221 is an apocalyptic number.

It is an amenable number.

222212202221 is a deficient number, since it is larger than the sum of its proper divisors (13071306031).

222212202221 is a wasteful number, since it uses less digits than its factorization.

222212202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13071306030.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 222212202221 its reverse (122202212222), we get a palindrome (344414414443).

The spelling of 222212202221 in words is "two hundred twenty-two billion, two hundred twelve million, two hundred two thousand, two hundred twenty-one".