21110424043 has 4 divisors (see below), whose sum is σ = 21399608008. Its totient is φ = 20821240080.

The previous prime is 21110424007. The next prime is 21110424089. The reversal of 21110424043 is 34042401112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21110424043 - 2²¹ = 21108326891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110464043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144591873 + ... + 144592018.

It is an arithmetic number, because the mean of its divisors is an integer number (5349902002).

Almost surely, 2^21110424043 is an apocalyptic number.

21110424043 is a deficient number, since it is larger than the sum of its proper divisors (289183965).

21110424043 is an equidigital number, since it uses as much as digits as its factorization.

21110424043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289183964.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21110424043 its reverse (34042401112), we get a palindrome (55152825155).

The spelling of 21110424043 in words is "twenty-one billion, one hundred ten million, four hundred twenty-four thousand, forty-three".