21320460606646 has 32 divisors (see below), whose sum is σ = 32750113927680. Its totient is φ = 10404996588000.

The previous prime is 21320460606629. The next prime is 21320460606677. The reversal of 21320460606646 is 64660606402312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21320460606596 and 21320460606605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640218196 + ... + 640251496.

It is an arithmetic number, because the mean of its divisors is an integer number (1023441060240).

Almost surely, 2^{21320460606646} is an apocalyptic number.

21320460606646 is a deficient number, since it is larger than the sum of its proper divisors (11429653321034).

21320460606646 is a wasteful number, since it uses less digits than its factorization.

21320460606646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51700.

The product of its (nonzero) digits is 1492992, while the sum is 46.

The spelling of 21320460606646 in words is "twenty-one trillion, three hundred twenty billion, four hundred sixty million, six hundred six thousand, six hundred forty-six".