21673042 has 8 divisors (see below), whose sum is σ = 32546736. Its totient is φ = 10824132.

The previous prime is 21673039. The next prime is 21673073. The reversal of 21673042 is 24037612.

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

It is a junction number, because it is equal to n+sod(n) for n = 21672998 and 21673016.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3828 + ... + 7615.

It is an arithmetic number, because the mean of its divisors is an integer number (4068342).

Almost surely, 2^21673042 is an apocalyptic number.

21673042 is a deficient number, since it is larger than the sum of its proper divisors (10873694).

21673042 is a wasteful number, since it uses less digits than its factorization.

21673042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12392.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21673042 is about 4655.4314515413. The cubic root of 21673042 is about 278.8088943641.

The spelling of 21673042 in words is "twenty-one million, six hundred seventy-three thousand, forty-two".