19621840319 has 4 divisors (see below), whose sum is σ = 19622172096. Its totient is φ = 19621508544.

The previous prime is 19621840289. The next prime is 19621840349. The reversal of 19621840319 is 91304812691.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (19621840289) and next prime (19621840349).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19621840319 is a prime.

It is a super-2 number, since 2×19621840319² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19621840319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19621840349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50354 + ... + 204399.

It is an arithmetic number, because the mean of its divisors is an integer number (4905543024).

Almost surely, 2^19621840319 is an apocalyptic number.

19621840319 is a deficient number, since it is larger than the sum of its proper divisors (331777).

19621840319 is an equidigital number, since it uses as much as digits as its factorization.

19621840319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331776.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 19621840319 in words is "nineteen billion, six hundred twenty-one million, eight hundred forty thousand, three hundred nineteen".