222112220211221 has 10 divisors (see below), whose sum is σ = 230044789021422. Its totient is φ = 214453177452080.

The previous prime is 222112220211209. The next prime is 222112220211241. The reversal of 222112220211221 is 122112022211222.

It can be written as a sum of positive squares in 5 ways, for example, as 31346124735121 + 190766095476100 = 5598761^2 + 13811810^2 .

It is a de Polignac number, because none of the positive numbers 2^k-222112220211221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222112220211241) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 156311090 + ... + 157725651.

Almost surely, 2^{222112220211221} is an apocalyptic number.

It is an amenable number.

222112220211221 is a deficient number, since it is larger than the sum of its proper divisors (7932568810201).

222112220211221 is an frugal number, since it uses more digits than its factorization.

222112220211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314036857 (or 314036770 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 222112220211221 its reverse (122112022211222), we get a palindrome (344224242422443).

The spelling of 222112220211221 in words is "two hundred twenty-two trillion, one hundred twelve billion, two hundred twenty million, two hundred eleven thousand, two hundred twenty-one".