20212121201213 has 2 divisors, whose sum is σ = 20212121201214. Its totient is φ = 20212121201212.

The previous prime is 20212121201191. The next prime is 20212121201249. The reversal of 20212121201213 is 31210212121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13970528372089 + 6241592829124 = 3737717^2 + 2498318^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212121201213 - 2¹⁰ = 20212121200189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212121200213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106060600606 + 10106060600607.

It is an arithmetic number, because the mean of its divisors is an integer number (10106060600607).

Almost surely, 2^{20212121201213} is an apocalyptic number.

It is an amenable number.

20212121201213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212121201213 is an equidigital number, since it uses as much as digits as its factorization.

20212121201213 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 20212121201213 its reverse (31210212121202), we get a palindrome (51422333322415).

The spelling of 20212121201213 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, two hundred one thousand, two hundred thirteen".