21382991713 has 4 divisors (see below), whose sum is σ = 21464296128. Its totient is φ = 21301687300.

The previous prime is 21382991701. The next prime is 21382991743. The reversal of 21382991713 is 31719928312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21382991713 - 2⁵ = 21382991681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21382991743) 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, 40651813 + ... + 40652338.

It is an arithmetic number, because the mean of its divisors is an integer number (5366074032).

Almost surely, 2^21382991713 is an apocalyptic number.

It is an amenable number.

21382991713 is a deficient number, since it is larger than the sum of its proper divisors (81304415).

21382991713 is an equidigital number, since it uses as much as digits as its factorization.

21382991713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81304414.

The product of its digits is 163296, while the sum is 46.

The spelling of 21382991713 in words is "twenty-one billion, three hundred eighty-two million, nine hundred ninety-one thousand, seven hundred thirteen".