21673423838 has 16 divisors (see below), whose sum is σ = 35724480624. Its totient is φ = 9779645760.

The previous prime is 21673423801. The next prime is 21673423909. The reversal of 21673423838 is 83832437612.

It is a junction number, because it is equal to n+sod(n) for n = 21673423792 and 21673423801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3592445 + ... + 3598472.

It is an arithmetic number, because the mean of its divisors is an integer number (2232780039).

Almost surely, 2^21673423838 is an apocalyptic number.

21673423838 is a deficient number, since it is larger than the sum of its proper divisors (14051056786).

21673423838 is a wasteful number, since it uses less digits than its factorization.

21673423838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7191067.

The product of its digits is 1161216, while the sum is 47.

The spelling of 21673423838 in words is "twenty-one billion, six hundred seventy-three million, four hundred twenty-three thousand, eight hundred thirty-eight".