19921212503 has 2 divisors, whose sum is σ = 19921212504. Its totient is φ = 19921212502.

The previous prime is 19921212499. The next prime is 19921212533. The reversal of 19921212503 is 30521212991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19921212503 - 2² = 19921212499 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19921212533) 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, 9960606251 + 9960606252.

It is an arithmetic number, because the mean of its divisors is an integer number (9960606252).

Almost surely, 2^19921212503 is an apocalyptic number.

19921212503 is a deficient number, since it is larger than the sum of its proper divisors (1).

19921212503 is an equidigital number, since it uses as much as digits as its factorization.

19921212503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The spelling of 19921212503 in words is "nineteen billion, nine hundred twenty-one million, two hundred twelve thousand, five hundred three".