21303232439 has 4 divisors (see below), whose sum is σ = 21458730624. Its totient is φ = 21147734256.

The previous prime is 21303232411. The next prime is 21303232471. The reversal of 21303232439 is 93423230312.

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 21303232439 - 2¹⁶ = 21303166903 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 (21303232039) 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, 77748887 + ... + 77749160.

It is an arithmetic number, because the mean of its divisors is an integer number (5364682656).

Almost surely, 2^21303232439 is an apocalyptic number.

21303232439 is a deficient number, since it is larger than the sum of its proper divisors (155498185).

21303232439 is a wasteful number, since it uses less digits than its factorization.

21303232439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155498184.

The product of its (nonzero) digits is 23328, while the sum is 32.

The spelling of 21303232439 in words is "twenty-one billion, three hundred three million, two hundred thirty-two thousand, four hundred thirty-nine".