21670606 has 8 divisors (see below), whose sum is σ = 32530680. Its totient is φ = 10827048.

The previous prime is 21670601. The next prime is 21670609. The reversal of 21670606 is 60607612.

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

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21670601) 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, 36 + ... + 6583.

It is an arithmetic number, because the mean of its divisors is an integer number (4066335).

Almost surely, 2^21670606 is an apocalyptic number.

21670606 is a deficient number, since it is larger than the sum of its proper divisors (10860074).

21670606 is a wasteful number, since it uses less digits than its factorization.

21670606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8258.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 21670606 is about 4655.1698143032. The cubic root of 21670606 is about 278.7984481469.

The spelling of 21670606 in words is "twenty-one million, six hundred seventy thousand, six hundred six".