21340269407 has 4 divisors (see below), whose sum is σ = 21345412080. Its totient is φ = 21335126736.

The previous prime is 21340269389. The next prime is 21340269437. The reversal of 21340269407 is 70496204312.

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 21340269407 - 2⁸ = 21340269151 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 (21340269437) 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, 2565107 + ... + 2573412.

It is an arithmetic number, because the mean of its divisors is an integer number (5336353020).

Almost surely, 2^21340269407 is an apocalyptic number.

21340269407 is a deficient number, since it is larger than the sum of its proper divisors (5142673).

21340269407 is an equidigital number, since it uses as much as digits as its factorization.

21340269407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5142672.

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 21340269407 in words is "twenty-one billion, three hundred forty million, two hundred sixty-nine thousand, four hundred seven".