19821430271 has 2 divisors, whose sum is σ = 19821430272. Its totient is φ = 19821430270.

The previous prime is 19821430261. The next prime is 19821430379. The reversal of 19821430271 is 17203412891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19821430271 - 2¹⁰ = 19821429247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19821430241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9910715135 + 9910715136.

It is an arithmetic number, because the mean of its divisors is an integer number (9910715136).

Almost surely, 2^19821430271 is an apocalyptic number.

19821430271 is a deficient number, since it is larger than the sum of its proper divisors (1).

19821430271 is an equidigital number, since it uses as much as digits as its factorization.

19821430271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 19821430271 in words is "nineteen billion, eight hundred twenty-one million, four hundred thirty thousand, two hundred seventy-one".