21672986 has 8 divisors (see below), whose sum is σ = 32539584. Its totient is φ = 10826460.

The previous prime is 21672983. The next prime is 21672997. The reversal of 21672986 is 68927612.

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

It is not an unprimeable number, because it can be changed into a prime (21672983) by changing a digit.

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, 1940 + ... + 6863.

It is an arithmetic number, because the mean of its divisors is an integer number (4067448).

Almost surely, 2^21672986 is an apocalyptic number.

21672986 is a deficient number, since it is larger than the sum of its proper divisors (10866598).

21672986 is a wasteful number, since it uses less digits than its factorization.

21672986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10036.

The product of its digits is 72576, while the sum is 41.

The square root of 21672986 is about 4655.4254370573. The cubic root of 21672986 is about 278.8086542300.

The spelling of 21672986 in words is "twenty-one million, six hundred seventy-two thousand, nine hundred eighty-six".