20212121110213 has 2 divisors, whose sum is σ = 20212121110214. Its totient is φ = 20212121110212.

The previous prime is 20212121110201. The next prime is 20212121110289. The reversal of 20212121110213 is 31201112121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10619764404804 + 9592356705409 = 3258798^2 + 3097153^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212121110213 - 2³⁷ = 20074682156741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212121110913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106060555106 + 10106060555107.

It is an arithmetic number, because the mean of its divisors is an integer number (10106060555107).

Almost surely, 2^{20212121110213} is an apocalyptic number.

It is an amenable number.

20212121110213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212121110213 is an equidigital number, since it uses as much as digits as its factorization.

20212121110213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 20212121110213 its reverse (31201112121202), we get a palindrome (51413233231415).

The spelling of 20212121110213 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, one hundred ten thousand, two hundred thirteen".