21317926382 has 4 divisors (see below), whose sum is σ = 31976889576. Its totient is φ = 10658963190.

The previous prime is 21317926381. The next prime is 21317926387. The reversal of 21317926382 is 28362971312.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21317926381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5329481594 + ... + 5329481597.

It is an arithmetic number, because the mean of its divisors is an integer number (7994222394).

Almost surely, 2^21317926382 is an apocalyptic number.

21317926382 is a deficient number, since it is larger than the sum of its proper divisors (10658963194).

21317926382 is a wasteful number, since it uses less digits than its factorization.

21317926382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10658963193.

The product of its digits is 217728, while the sum is 44.

The spelling of 21317926382 in words is "twenty-one billion, three hundred seventeen million, nine hundred twenty-six thousand, three hundred eighty-two".