20212123213 has 2 divisors, whose sum is σ = 20212123214. Its totient is φ = 20212123212.

The previous prime is 20212123201. The next prime is 20212123289. The reversal of 20212123213 is 31232121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18676502244 + 1535620969 = 136662^2 + 39187^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212123213 - 2²¹ = 20210026061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212127213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106061606 + 10106061607.

It is an arithmetic number, because the mean of its divisors is an integer number (10106061607).

Almost surely, 2^20212123213 is an apocalyptic number.

It is an amenable number.

20212123213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212123213 is an equidigital number, since it uses as much as digits as its factorization.

20212123213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20212123213 its reverse (31232121202), we get a palindrome (51444244415).

The spelling of 20212123213 in words is "twenty billion, two hundred twelve million, one hundred twenty-three thousand, two hundred thirteen".