21006112443 has 8 divisors (see below), whose sum is σ = 28024938000. Its totient is φ = 13995680928.

The previous prime is 21006112427. The next prime is 21006112447. The reversal of 21006112443 is 34421160012.

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

It is not a de Polignac number, because 21006112443 - 2⁴ = 21006112427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21006112447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2092668 + ... + 2102681.

It is an arithmetic number, because the mean of its divisors is an integer number (3503117250).

Almost surely, 2^21006112443 is an apocalyptic number.

21006112443 is a deficient number, since it is larger than the sum of its proper divisors (7018825557).

21006112443 is a wasteful number, since it uses less digits than its factorization.

21006112443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4197021.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21006112443 its reverse (34421160012), we get a palindrome (55427272455).

The spelling of 21006112443 in words is "twenty-one billion, six million, one hundred twelve thousand, four hundred forty-three".