21673423815 has 8 divisors (see below), whose sum is σ = 34677478128. Its totient is φ = 11559159360.

The previous prime is 21673423801. The next prime is 21673423909. The reversal of 21673423815 is 51832437612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21673423815 - 2¹⁶ = 21673358279 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 722447446 + ... + 722447475.

It is an arithmetic number, because the mean of its divisors is an integer number (4334684766).

Almost surely, 2^21673423815 is an apocalyptic number.

21673423815 is a deficient number, since it is larger than the sum of its proper divisors (13004054313).

21673423815 is a wasteful number, since it uses less digits than its factorization.

21673423815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444894929.

The product of its digits is 241920, while the sum is 42.

The spelling of 21673423815 in words is "twenty-one billion, six hundred seventy-three million, four hundred twenty-three thousand, eight hundred fifteen".