21164006 has 8 divisors (see below), whose sum is σ = 32421600. Its totient is φ = 10356808.

The previous prime is 21163999. The next prime is 21164029. The reversal of 21164006 is 60046112.

It is a happy number.

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, 112481 + ... + 112668.

It is an arithmetic number, because the mean of its divisors is an integer number (4052700).

Almost surely, 2^21164006 is an apocalyptic number.

21164006 is a deficient number, since it is larger than the sum of its proper divisors (11257594).

21164006 is a wasteful number, since it uses less digits than its factorization.

21164006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225198.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21164006 is about 4600.4354141755. The cubic root of 21164006 is about 276.6087783920.

The spelling of 21164006 in words is "twenty-one million, one hundred sixty-four thousand, six".