211221010213 has 2 divisors, whose sum is σ = 211221010214. Its totient is φ = 211221010212.

The previous prime is 211221010201. The next prime is 211221010241. The reversal of 211221010213 is 312010122112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155947589604 + 55273420609 = 394902^2 + 235103^2 .

It is a cyclic number.

It is not a de Polignac number, because 211221010213 - 2⁵ = 211221010181 is a prime.

It is a super-2 number, since 2×211221010213² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211221010283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610505106 + 105610505107.

It is an arithmetic number, because the mean of its divisors is an integer number (105610505107).

Almost surely, 2^211221010213 is an apocalyptic number.

It is an amenable number.

211221010213 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221010213 is an equidigital number, since it uses as much as digits as its factorization.

211221010213 is an evil number, because the sum of its binary digits is even.

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

Adding to 211221010213 its reverse (312010122112), we get a palindrome (523231132325).

The spelling of 211221010213 in words is "two hundred eleven billion, two hundred twenty-one million, ten thousand, two hundred thirteen".