21313326634 has 8 divisors (see below), whose sum is σ = 31971224160. Its totient is φ = 10656251916.

The previous prime is 21313326631. The next prime is 21313326647. The reversal of 21313326634 is 43662331312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21313326634.

It is not an unprimeable number, because it can be changed into a prime (21313326631) 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, 136254 + ... + 247369.

It is an arithmetic number, because the mean of its divisors is an integer number (3996403020).

Almost surely, 2^21313326634 is an apocalyptic number.

21313326634 is a deficient number, since it is larger than the sum of its proper divisors (10657897526).

21313326634 is a wasteful number, since it uses less digits than its factorization.

21313326634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411404.

The product of its digits is 46656, while the sum is 34.

Adding to 21313326634 its reverse (43662331312), we get a palindrome (64975657946).

The spelling of 21313326634 in words is "twenty-one billion, three hundred thirteen million, three hundred twenty-six thousand, six hundred thirty-four".