19423209819 has 16 divisors (see below), whose sum is σ = 29357619200. Its totient is φ = 11323652256.

The previous prime is 19423209803. The next prime is 19423209863. The reversal of 19423209819 is 91890232491.

It is not a de Polignac number, because 19423209819 - 2⁴ = 19423209803 is a prime.

It is a super-2 number, since 2×19423209819² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19423209319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13105339 + ... + 13106820.

It is an arithmetic number, because the mean of its divisors is an integer number (1834851200).

Almost surely, 2^19423209819 is an apocalyptic number.

19423209819 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19423209819 is a deficient number, since it is larger than the sum of its proper divisors (9934409381).

19423209819 is a wasteful number, since it uses less digits than its factorization.

19423209819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26212194.

The product of its (nonzero) digits is 279936, while the sum is 48.

The spelling of 19423209819 in words is "nineteen billion, four hundred twenty-three million, two hundred nine thousand, eight hundred nineteen".