210121211213 has 2 divisors, whose sum is σ = 210121211214. Its totient is φ = 210121211212.

The previous prime is 210121211207. The next prime is 210121211221. The reversal of 210121211213 is 312112121012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202214800489 + 7906410724 = 449683^2 + 88918^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121211213 - 2¹⁸ = 210120949069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210121211191 and 210121211200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210121211273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060605606 + 105060605607.

It is an arithmetic number, because the mean of its divisors is an integer number (105060605607).

Almost surely, 2^210121211213 is an apocalyptic number.

It is an amenable number.

210121211213 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121211213 is an equidigital number, since it uses as much as digits as its factorization.

210121211213 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 17.

Adding to 210121211213 its reverse (312112121012), we get a palindrome (522233332225).

The spelling of 210121211213 in words is "two hundred ten billion, one hundred twenty-one million, two hundred eleven thousand, two hundred thirteen".