19821631499 has 2 divisors, whose sum is σ = 19821631500. Its totient is φ = 19821631498.

The previous prime is 19821631493. The next prime is 19821631517. The reversal of 19821631499 is 99413612891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19821631499 - 2⁴ = 19821631483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19821631499.

It is not a weakly prime, because it can be changed into another prime (19821631493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9910815749 + 9910815750.

It is an arithmetic number, because the mean of its divisors is an integer number (9910815750).

Almost surely, 2^19821631499 is an apocalyptic number.

19821631499 is a deficient number, since it is larger than the sum of its proper divisors (1).

19821631499 is an equidigital number, since it uses as much as digits as its factorization.

19821631499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 53.

The spelling of 19821631499 in words is "nineteen billion, eight hundred twenty-one million, six hundred thirty-one thousand, four hundred ninety-nine".