21303234839 has 4 divisors (see below), whose sum is σ = 21305307240. Its totient is φ = 21301162440.

The previous prime is 21303234773. The next prime is 21303234857. The reversal of 21303234839 is 93843230312.

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-21303234839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303236839) 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, 1020704 + ... + 1041365.

It is an arithmetic number, because the mean of its divisors is an integer number (5326326810).

Almost surely, 2^21303234839 is an apocalyptic number.

21303234839 is a deficient number, since it is larger than the sum of its proper divisors (2072401).

21303234839 is a wasteful number, since it uses less digits than its factorization.

21303234839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072400.

The product of its (nonzero) digits is 93312, while the sum is 38.

The spelling of 21303234839 in words is "twenty-one billion, three hundred three million, two hundred thirty-four thousand, eight hundred thirty-nine".