212122030319981 has 2 divisors, whose sum is σ = 212122030319982. Its totient is φ = 212122030319980.

The previous prime is 212122030319929. The next prime is 212122030320023. The reversal of 212122030319981 is 189913030221212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143178335461225 + 68943694858756 = 11965715^2 + 8303234^2 .

It is a cyclic number.

It is not a de Polignac number, because 212122030319981 - 2⁶ = 212122030319917 is a prime.

It is a super-2 number, since 2×212122030319981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212122030519981) 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, 106061015159990 + 106061015159991.

It is an arithmetic number, because the mean of its divisors is an integer number (106061015159991).

Almost surely, 2^{212122030319981} is an apocalyptic number.

It is an amenable number.

212122030319981 is a deficient number, since it is larger than the sum of its proper divisors (1).

212122030319981 is an equidigital number, since it uses as much as digits as its factorization.

212122030319981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 212122030319981 in words is "two hundred twelve trillion, one hundred twenty-two billion, thirty million, three hundred nineteen thousand, nine hundred eighty-one".