21366706 has 8 divisors (see below), whose sum is σ = 32071680. Its totient is φ = 10676148.

The previous prime is 21366689. The next prime is 21366713. The reversal of 21366706 is 60766312.

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

It is a super-2 number, since 2×21366706² = 913072250580872, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1615 + ... + 6733.

It is an arithmetic number, because the mean of its divisors is an integer number (4008960).

Almost surely, 2^21366706 is an apocalyptic number.

21366706 is a deficient number, since it is larger than the sum of its proper divisors (10704974).

21366706 is a wasteful number, since it uses less digits than its factorization.

21366706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7208.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 21366706 is about 4622.4134388867. The cubic root of 21366706 is about 277.4890551104.

The spelling of 21366706 in words is "twenty-one million, three hundred sixty-six thousand, seven hundred six".