212222221021 has 2 divisors, whose sum is σ = 212222221022. Its totient is φ = 212222221020.

The previous prime is 212222220989. The next prime is 212222221061. The reversal of 212222221021 is 120122222212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205516248921 + 6705972100 = 453339^2 + 81890^2 .

It is a cyclic number.

It is not a de Polignac number, because 212222221021 - 2⁵ = 212222220989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212222221021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212222221061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106111110510 + 106111110511.

It is an arithmetic number, because the mean of its divisors is an integer number (106111110511).

Almost surely, 2^212222221021 is an apocalyptic number.

It is an amenable number.

212222221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212222221021 is an equidigital number, since it uses as much as digits as its factorization.

212222221021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 212222221021 its reverse (120122222212), we get a palindrome (332344443233).

The spelling of 212222221021 in words is "two hundred twelve billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty-one".