21318259822 has 4 divisors (see below), whose sum is σ = 31977389736. Its totient is φ = 10659129910.

The previous prime is 21318259817. The next prime is 21318259867. The reversal of 21318259822 is 22895281312.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5329564954 + ... + 5329564957.

It is an arithmetic number, because the mean of its divisors is an integer number (7994347434).

Almost surely, 2^21318259822 is an apocalyptic number.

21318259822 is a deficient number, since it is larger than the sum of its proper divisors (10659129914).

21318259822 is a wasteful number, since it uses less digits than its factorization.

21318259822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10659129913.

The product of its digits is 138240, while the sum is 43.

The spelling of 21318259822 in words is "twenty-one billion, three hundred eighteen million, two hundred fifty-nine thousand, eight hundred twenty-two".