19821430379 has 2 divisors, whose sum is σ = 19821430380. Its totient is φ = 19821430378.

The previous prime is 19821430271. The next prime is 19821430451. The reversal of 19821430379 is 97303412891.

It is a strong prime.

It is an emirp because it is prime and its reverse (97303412891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19821430379 - 2²⁰ = 19820381803 is a prime.

It is not a weakly prime, because it can be changed into another prime (19821430579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9910715189 + 9910715190.

It is an arithmetic number, because the mean of its divisors is an integer number (9910715190).

Almost surely, 2^19821430379 is an apocalyptic number.

19821430379 is a deficient number, since it is larger than the sum of its proper divisors (1).

19821430379 is an equidigital number, since it uses as much as digits as its factorization.

19821430379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 19821430379 in words is "nineteen billion, eight hundred twenty-one million, four hundred thirty thousand, three hundred seventy-nine".