19921212533 has 2 divisors, whose sum is σ = 19921212534. Its totient is φ = 19921212532.

The previous prime is 19921212503. The next prime is 19921212541. The reversal of 19921212533 is 33521212991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19915418884 + 5793649 = 141122^2 + 2407^2 .

It is a cyclic number.

It is not a de Polignac number, because 19921212533 - 2²⁰ = 19920163957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19921212503) 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, 9960606266 + 9960606267.

It is an arithmetic number, because the mean of its divisors is an integer number (9960606267).

Almost surely, 2^19921212533 is an apocalyptic number.

It is an amenable number.

19921212533 is a deficient number, since it is larger than the sum of its proper divisors (1).

19921212533 is an equidigital number, since it uses as much as digits as its factorization.

19921212533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The spelling of 19921212533 in words is "nineteen billion, nine hundred twenty-one million, two hundred twelve thousand, five hundred thirty-three".