21313426406 has 4 divisors (see below), whose sum is σ = 31970139612. Its totient is φ = 10656713202.

The previous prime is 21313426367. The next prime is 21313426423. The reversal of 21313426406 is 60462431312.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5328356600 + ... + 5328356603.

It is an arithmetic number, because the mean of its divisors is an integer number (7992534903).

Almost surely, 2^21313426406 is an apocalyptic number.

21313426406 is a deficient number, since it is larger than the sum of its proper divisors (10656713206).

21313426406 is a wasteful number, since it uses less digits than its factorization.

21313426406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10656713205.

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 21313426406 its reverse (60462431312), we get a palindrome (81775857718).

The spelling of 21313426406 in words is "twenty-one billion, three hundred thirteen million, four hundred twenty-six thousand, four hundred six".