21444615043 has 4 divisors (see below), whose sum is σ = 21498093288. Its totient is φ = 21391136800.

The previous prime is 21444615037. The next prime is 21444615047. The reversal of 21444615043 is 34051644412.

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 21444615043 - 2¹³ = 21444606851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21444615047) 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, 26738521 + ... + 26739322.

It is an arithmetic number, because the mean of its divisors is an integer number (5374523322).

Almost surely, 2^21444615043 is an apocalyptic number.

21444615043 is a deficient number, since it is larger than the sum of its proper divisors (53478245).

21444615043 is an equidigital number, since it uses as much as digits as its factorization.

21444615043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53478244.

The product of its (nonzero) digits is 46080, while the sum is 34.

The spelling of 21444615043 in words is "twenty-one billion, four hundred forty-four million, six hundred fifteen thousand, forty-three".