21323872859 has 4 divisors (see below), whose sum is σ = 21479521704. Its totient is φ = 21168224016.

The previous prime is 21323872847. The next prime is 21323872879. The reversal of 21323872859 is 95827832312.

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 21323872859 - 2¹² = 21323868763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21323872879) 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, 77824217 + ... + 77824490.

It is an arithmetic number, because the mean of its divisors is an integer number (5369880426).

Almost surely, 2^21323872859 is an apocalyptic number.

21323872859 is a deficient number, since it is larger than the sum of its proper divisors (155648845).

21323872859 is a wasteful number, since it uses less digits than its factorization.

21323872859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155648844.

The product of its digits is 1451520, while the sum is 50.

The spelling of 21323872859 in words is "twenty-one billion, three hundred twenty-three million, eight hundred seventy-two thousand, eight hundred fifty-nine".