21002212211213 has 2 divisors, whose sum is σ = 21002212211214. Its totient is φ = 21002212211212.

The previous prime is 21002212211171. The next prime is 21002212211251. The reversal of 21002212211213 is 31211221220012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20554272477124 + 447939734089 = 4533682^2 + 669283^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002212211213 - 2²⁰ = 21002211162637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002212211263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501106105606 + 10501106105607.

It is an arithmetic number, because the mean of its divisors is an integer number (10501106105607).

Almost surely, 2^{21002212211213} is an apocalyptic number.

It is an amenable number.

21002212211213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002212211213 is an equidigital number, since it uses as much as digits as its factorization.

21002212211213 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 20.

Adding to 21002212211213 its reverse (31211221220012), we get a palindrome (52213433431225).

The spelling of 21002212211213 in words is "twenty-one trillion, two billion, two hundred twelve million, two hundred eleven thousand, two hundred thirteen".