21673763323 has 4 divisors (see below), whose sum is σ = 21897204280. Its totient is φ = 21450322368.

The previous prime is 21673763317. The next prime is 21673763327. The reversal of 21673763323 is 32336737612.

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

It is a de Polignac number, because none of the positive numbers 2^k-21673763323 is a prime.

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 21673763323.

It is not an unprimeable number, because it can be changed into a prime (21673763327) 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, 111720333 + ... + 111720526.

It is an arithmetic number, because the mean of its divisors is an integer number (5474301070).

Almost surely, 2^21673763323 is an apocalyptic number.

21673763323 is a deficient number, since it is larger than the sum of its proper divisors (223440957).

21673763323 is an equidigital number, since it uses as much as digits as its factorization.

21673763323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223440956.

The product of its digits is 571536, while the sum is 43.

It can be divided in two parts, 21673 and 763323, that added together give a square (784996 = 886²).

The spelling of 21673763323 in words is "twenty-one billion, six hundred seventy-three million, seven hundred sixty-three thousand, three hundred twenty-three".