21364631606 has 16 divisors (see below), whose sum is σ = 32378374080. Its totient is φ = 10571932800.

The previous prime is 21364631599. The next prime is 21364631611. The reversal of 21364631606 is 60613646312.

It is a self number, because there is not a number n which added to its sum of digits gives 21364631606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466355 + ... + 510113.

It is an arithmetic number, because the mean of its divisors is an integer number (2023648380).

Almost surely, 2^21364631606 is an apocalyptic number.

21364631606 is a deficient number, since it is larger than the sum of its proper divisors (11013742474).

21364631606 is a wasteful number, since it uses less digits than its factorization.

21364631606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46279.

The product of its (nonzero) digits is 93312, while the sum is 38.

The spelling of 21364631606 in words is "twenty-one billion, three hundred sixty-four million, six hundred thirty-one thousand, six hundred six".