212222222021261 has 2 divisors, whose sum is σ = 212222222021262. Its totient is φ = 212222222021260.

The previous prime is 212222222021219. The next prime is 212222222021321. The reversal of 212222222021261 is 162120222222212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212218174644100 + 4047377161 = 14567710^2 + 63619^2 .

It is a cyclic number.

It is not a de Polignac number, because 212222222021261 - 2⁶ = 212222222021197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212222222023261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106111111010630 + 106111111010631.

It is an arithmetic number, because the mean of its divisors is an integer number (106111111010631).

Almost surely, 2^{212222222021261} is an apocalyptic number.

It is an amenable number.

212222222021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

212222222021261 is an equidigital number, since it uses as much as digits as its factorization.

212222222021261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 212222222021261 its reverse (162120222222212), we get a palindrome (374342444243473).

The spelling of 212222222021261 in words is "two hundred twelve trillion, two hundred twenty-two billion, two hundred twenty-two million, twenty-one thousand, two hundred sixty-one".