21673492 has 24 divisors (see below), whose sum is σ = 38828160. Its totient is φ = 10583040.

The previous prime is 21673459. The next prime is 21673511. The reversal of 21673492 is 29437612.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 33492 + ... + 34132.

It is an arithmetic number, because the mean of its divisors is an integer number (1617840).

Almost surely, 2^21673492 is an apocalyptic number.

It is an amenable number.

21673492 is a deficient number, since it is larger than the sum of its proper divisors (17154668).

21673492 is a wasteful number, since it uses less digits than its factorization.

21673492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831 (or 829 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 21673492 is about 4655.4797819344. The cubic root of 21673492 is about 278.8108239984.

The spelling of 21673492 in words is "twenty-one million, six hundred seventy-three thousand, four hundred ninety-two".