21673270 has 8 divisors (see below), whose sum is σ = 39011904. Its totient is φ = 8669304.

The previous prime is 21673261. The next prime is 21673271. The reversal of 21673270 is 7237612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21673271) 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 3 ways as a sum of consecutive naturals, for example, 1083654 + ... + 1083673.

It is an arithmetic number, because the mean of its divisors is an integer number (4876488).

Almost surely, 2^21673270 is an apocalyptic number.

21673270 is a deficient number, since it is larger than the sum of its proper divisors (17338634).

21673270 is a wasteful number, since it uses less digits than its factorization.

21673270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2167334.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 21673270 is about 4655.4559390032. The cubic root of 21673270 is about 278.8098720488.

The spelling of 21673270 in words is "twenty-one million, six hundred seventy-three thousand, two hundred seventy".