21323510039 has 4 divisors (see below), whose sum is σ = 22963780056. Its totient is φ = 19683240024.

The previous prime is 21323510029. The next prime is 21323510081. The reversal of 21323510039 is 93001532312.

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 21323510039 - 2²⁴ = 21306732823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323509993 and 21323510020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323510009) 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, 820134989 + ... + 820135014.

It is an arithmetic number, because the mean of its divisors is an integer number (5740945014).

Almost surely, 2^21323510039 is an apocalyptic number.

21323510039 is a deficient number, since it is larger than the sum of its proper divisors (1640270017).

21323510039 is a wasteful number, since it uses less digits than its factorization.

21323510039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640270016.

The product of its (nonzero) digits is 4860, while the sum is 29.

The spelling of 21323510039 in words is "twenty-one billion, three hundred twenty-three million, five hundred ten thousand, thirty-nine".