21673386 has 48 divisors (see below), whose sum is σ = 56033280. Its totient is φ = 6191640.

The previous prime is 21673381. The next prime is 21673387. The reversal of 21673386 is 68337612.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21673386.

It is not an unprimeable number, because it can be changed into a prime (21673381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1450 + ... + 6741.

It is an arithmetic number, because the mean of its divisors is an integer number (1167360).

Almost surely, 2^21673386 is an apocalyptic number.

21673386 is an abundant number, since it is smaller than the sum of its proper divisors (34359894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21673386 is a wasteful number, since it uses less digits than its factorization.

21673386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8216 (or 8203 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 21673386 is about 4655.4683974870. The cubic root of 21673386 is about 278.8103694647.

The spelling of 21673386 in words is "twenty-one million, six hundred seventy-three thousand, three hundred eighty-six".