20011111111213 has 2 divisors, whose sum is σ = 20011111111214. Its totient is φ = 20011111111212.

The previous prime is 20011111111039. The next prime is 20011111111217. The reversal of 20011111111213 is 31211111111002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14837387836489 + 5173723274724 = 3851933^2 + 2274582^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011111111213 - 2²⁵ = 20011077556781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011111111217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005555555606 + 10005555555607.

It is an arithmetic number, because the mean of its divisors is an integer number (10005555555607).

Almost surely, 2^{20011111111213} is an apocalyptic number.

It is an amenable number.

20011111111213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011111111213 is an equidigital number, since it uses as much as digits as its factorization.

20011111111213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 16.

Adding to 20011111111213 its reverse (31211111111002), we get a palindrome (51222222222215).

The spelling of 20011111111213 in words is "twenty trillion, eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred thirteen".