21423006806 has 8 divisors (see below), whose sum is σ = 33825800280. Its totient is φ = 10147740048.

The previous prime is 21423006799. The next prime is 21423006821. The reversal of 21423006806 is 60860032412.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281881631 + ... + 281881706.

It is an arithmetic number, because the mean of its divisors is an integer number (4228225035).

Almost surely, 2^21423006806 is an apocalyptic number.

21423006806 is a deficient number, since it is larger than the sum of its proper divisors (12402793474).

21423006806 is a wasteful number, since it uses less digits than its factorization.

21423006806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563763358.

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 21423006806 in words is "twenty-one billion, four hundred twenty-three million, six thousand, eight hundred six".