21338426807 has 4 divisors (see below), whose sum is σ = 21792435936. Its totient is φ = 20884417680.

The previous prime is 21338426803. The next prime is 21338426839. The reversal of 21338426807 is 70862483312.

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 21338426807 - 2² = 21338426803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338426803) 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, 227004494 + ... + 227004587.

It is an arithmetic number, because the mean of its divisors is an integer number (5448108984).

Almost surely, 2^21338426807 is an apocalyptic number.

21338426807 is a deficient number, since it is larger than the sum of its proper divisors (454009129).

21338426807 is an equidigital number, since it uses as much as digits as its factorization.

21338426807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454009128.

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 21338426807 in words is "twenty-one billion, three hundred thirty-eight million, four hundred twenty-six thousand, eight hundred seven".