211021021213 has 2 divisors, whose sum is σ = 211021021214. Its totient is φ = 211021021212.

The previous prime is 211021021171. The next prime is 211021021229. The reversal of 211021021213 is 312120120112.

It is an a-pointer prime, because the next prime (211021021229) can be obtained adding 211021021213 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147538187449 + 63482833764 = 384107^2 + 251958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211021021213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211021021283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510510606 + 105510510607.

It is an arithmetic number, because the mean of its divisors is an integer number (105510510607).

Almost surely, 2^211021021213 is an apocalyptic number.

It is an amenable number.

211021021213 is a deficient number, since it is larger than the sum of its proper divisors (1).

211021021213 is an equidigital number, since it uses as much as digits as its factorization.

211021021213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 211021021213 its reverse (312120120112), we get a palindrome (523141141325).

The spelling of 211021021213 in words is "two hundred eleven billion, twenty-one million, twenty-one thousand, two hundred thirteen".