21340320407 has 6 divisors (see below), whose sum is σ = 24824454408. Its totient is φ = 18291703164.

The previous prime is 21340320389. The next prime is 21340320457. The reversal of 21340320407 is 70402304312.

It is not a de Polignac number, because 21340320407 - 2¹⁰ = 21340319383 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 (21340320457) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 217758323 + ... + 217758420.

It is an arithmetic number, because the mean of its divisors is an integer number (4137409068).

Almost surely, 2^21340320407 is an apocalyptic number.

21340320407 is a deficient number, since it is larger than the sum of its proper divisors (3484134001).

21340320407 is an equidigital number, since it uses as much as digits as its factorization.

21340320407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435516757 (or 435516750 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

Adding to 21340320407 its reverse (70402304312), we get a palindrome (91742624719).

The spelling of 21340320407 in words is "twenty-one billion, three hundred forty million, three hundred twenty thousand, four hundred seven".