21839643373 has 4 divisors (see below), whose sum is σ = 22209806880. Its totient is φ = 21469479868.

The previous prime is 21839643367. The next prime is 21839643383. The reversal of 21839643373 is 37334693812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21839643373 - 2¹⁷ = 21839512301 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21839643323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185081665 + ... + 185081782.

It is an arithmetic number, because the mean of its divisors is an integer number (5552451720).

Almost surely, 2^21839643373 is an apocalyptic number.

It is an amenable number.

21839643373 is a deficient number, since it is larger than the sum of its proper divisors (370163507).

21839643373 is an equidigital number, since it uses as much as digits as its factorization.

21839643373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370163506.

The product of its digits is 1959552, while the sum is 49.

The spelling of 21839643373 in words is "twenty-one billion, eight hundred thirty-nine million, six hundred forty-three thousand, three hundred seventy-three".