19964672213 has 2 divisors, whose sum is σ = 19964672214. Its totient is φ = 19964672212.

The previous prime is 19964672191. The next prime is 19964672219. The reversal of 19964672213 is 31227646991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14195054449 + 5769617764 = 119143^2 + 75958^2 .

It is an emirp because it is prime and its reverse (31227646991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19964672213 - 2⁸ = 19964671957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19964672219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9982336106 + 9982336107.

It is an arithmetic number, because the mean of its divisors is an integer number (9982336107).

Almost surely, 2^19964672213 is an apocalyptic number.

It is an amenable number.

19964672213 is a deficient number, since it is larger than the sum of its proper divisors (1).

19964672213 is an equidigital number, since it uses as much as digits as its factorization.

19964672213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 50.

The spelling of 19964672213 in words is "nineteen billion, nine hundred sixty-four million, six hundred seventy-two thousand, two hundred thirteen".