21313426405 has 8 divisors (see below), whose sum is σ = 27080588952. Its totient is φ = 16047756288.

The previous prime is 21313426367. The next prime is 21313426423. The reversal of 21313426405 is 50462431312.

It can be written as a sum of positive squares in 4 ways, for example, as 432598401 + 20880828004 = 20799^2 + 144502^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21313426405 - 2²³ = 21305037797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125373012 + ... + 125373181.

It is an arithmetic number, because the mean of its divisors is an integer number (3385073619).

Almost surely, 2^21313426405 is an apocalyptic number.

It is an amenable number.

21313426405 is a deficient number, since it is larger than the sum of its proper divisors (5767162547).

21313426405 is a wasteful number, since it uses less digits than its factorization.

21313426405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250746215.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21313426405 its reverse (50462431312), we get a palindrome (71775857717).

The spelling of 21313426405 in words is "twenty-one billion, three hundred thirteen million, four hundred twenty-six thousand, four hundred five".