22212111221 has 2 divisors, whose sum is σ = 22212111222. Its totient is φ = 22212111220.

The previous prime is 22212111211. The next prime is 22212111239. The reversal of 22212111221 is 12211121222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19294599025 + 2917512196 = 138905^2 + 54014^2 .

It is a cyclic number.

It is not a de Polignac number, because 22212111221 - 2¹⁰ = 22212110197 is a prime.

It is a super-2 number, since 2×22212111221² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22212111221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22212111211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11106055610 + 11106055611.

It is an arithmetic number, because the mean of its divisors is an integer number (11106055611).

Almost surely, 2^22212111221 is an apocalyptic number.

It is an amenable number.

22212111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22212111221 is an equidigital number, since it uses as much as digits as its factorization.

22212111221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64, while the sum is 17.

Adding to 22212111221 its reverse (12211121222), we get a palindrome (34423232443).

The spelling of 22212111221 in words is "twenty-two billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty-one".