222221311021 has 2 divisors, whose sum is σ = 222221311022. Its totient is φ = 222221311020.

The previous prime is 222221311009. The next prime is 222221311031. The reversal of 222221311021 is 120113122222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166697457796 + 55523853225 = 408286^2 + 235635^2 .

It is a cyclic number.

It is not a de Polignac number, because 222221311021 - 2¹³ = 222221302829 is a prime.

It is a super-2 number, since 2×222221311021² (a number of 23 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 222221311021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222221311001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110655510 + 111110655511.

It is an arithmetic number, because the mean of its divisors is an integer number (111110655511).

Almost surely, 2^222221311021 is an apocalyptic number.

It is an amenable number.

222221311021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222221311021 is an equidigital number, since it uses as much as digits as its factorization.

222221311021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 222221311021 its reverse (120113122222), we get a palindrome (342334433243).

The spelling of 222221311021 in words is "two hundred twenty-two billion, two hundred twenty-one million, three hundred eleven thousand, twenty-one".