221212311013 has 2 divisors, whose sum is σ = 221212311014. Its totient is φ = 221212311012.

The previous prime is 221212310993. The next prime is 221212311037. The reversal of 221212311013 is 310113212122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168007352769 + 53204958244 = 409887^2 + 230662^2 .

It is a cyclic number.

It is not a de Polignac number, because 221212311013 - 2⁵ = 221212310981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221212351013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606155506 + 110606155507.

It is an arithmetic number, because the mean of its divisors is an integer number (110606155507).

Almost surely, 2^221212311013 is an apocalyptic number.

It is an amenable number.

221212311013 is a deficient number, since it is larger than the sum of its proper divisors (1).

221212311013 is an equidigital number, since it uses as much as digits as its factorization.

221212311013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 221212311013 its reverse (310113212122), we get a palindrome (531325523135).

The spelling of 221212311013 in words is "two hundred twenty-one billion, two hundred twelve million, three hundred eleven thousand, thirteen".