21005110313443 has 8 divisors (see below), whose sum is σ = 21301618796640. Its totient is φ = 20708620215360.

The previous prime is 21005110313437. The next prime is 21005110313461. The reversal of 21005110313443 is 34431301150012.

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-21005110313443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21005110313843) by changing a digit.

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, 2287008 + ... + 6873181.

It is an arithmetic number, because the mean of its divisors is an integer number (2662702349580).

Almost surely, 2^{21005110313443} is an apocalyptic number.

21005110313443 is a deficient number, since it is larger than the sum of its proper divisors (296508483197).

21005110313443 is an equidigital number, since it uses as much as digits as its factorization.

21005110313443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9192557.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 21005110313443 its reverse (34431301150012), we get a palindrome (55436411463455).

The spelling of 21005110313443 in words is "twenty-one trillion, five billion, one hundred ten million, three hundred thirteen thousand, four hundred forty-three".