21620406083443 has 8 divisors (see below), whose sum is σ = 21627546760512. Its totient is φ = 21613266594816.

The previous prime is 21620406083359. The next prime is 21620406083509. The reversal of 21620406083443 is 34438060402612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21620406083443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21620406083443.

It is not an unprimeable number, because it can be changed into a prime (21620406093443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36856371 + ... + 37438387.

It is an arithmetic number, because the mean of its divisors is an integer number (2703443345064).

Almost surely, 2^{21620406083443} is an apocalyptic number.

21620406083443 is a deficient number, since it is larger than the sum of its proper divisors (7140677069).

21620406083443 is an equidigital number, since it uses as much as digits as its factorization.

21620406083443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594221.

The product of its (nonzero) digits is 663552, while the sum is 43.

The spelling of 21620406083443 in words is "twenty-one trillion, six hundred twenty billion, four hundred six million, eighty-three thousand, four hundred forty-three".