21140044003 has 4 divisors (see below), whose sum is σ = 22766201248. Its totient is φ = 19513886760.

The previous prime is 21140043961. The next prime is 21140044007. The reversal of 21140044003 is 30044004112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21140044003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140044007) 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, 813078603 + ... + 813078628.

It is an arithmetic number, because the mean of its divisors is an integer number (5691550312).

Almost surely, 2^21140044003 is an apocalyptic number.

21140044003 is a deficient number, since it is larger than the sum of its proper divisors (1626157245).

21140044003 is a wasteful number, since it uses less digits than its factorization.

21140044003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626157244.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21140044003 its reverse (30044004112), we get a palindrome (51184048115).

The spelling of 21140044003 in words is "twenty-one billion, one hundred forty million, forty-four thousand, three".