20212121200013 has 2 divisors, whose sum is σ = 20212121200014. Its totient is φ = 20212121200012.

The previous prime is 20212121200009. The next prime is 20212121200043. The reversal of 20212121200013 is 31000212121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15553266600169 + 4658854599844 = 3943763^2 + 2158438^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212121200013 - 2² = 20212121200009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20212121199964 and 20212121200000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212121200043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106060600006 + 10106060600007.

It is an arithmetic number, because the mean of its divisors is an integer number (10106060600007).

Almost surely, 2^{20212121200013} is an apocalyptic number.

It is an amenable number.

20212121200013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212121200013 is an equidigital number, since it uses as much as digits as its factorization.

20212121200013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20212121200013 its reverse (31000212121202), we get a palindrome (51212333321215).

The spelling of 20212121200013 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, two hundred thousand, thirteen".