21816634326 has 16 divisors (see below), whose sum is σ = 43640223744. Its totient is φ = 7271052264.

The previous prime is 21816634321. The next prime is 21816634339. The reversal of 21816634326 is 62343661812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21816634321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248566 + ... + 324681.

It is an arithmetic number, because the mean of its divisors is an integer number (2727513984).

Almost surely, 2^21816634326 is an apocalyptic number.

21816634326 is an abundant number, since it is smaller than the sum of its proper divisors (21823589418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21816634326 is a wasteful number, since it uses less digits than its factorization.

21816634326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579595.

The product of its digits is 248832, while the sum is 42.

The spelling of 21816634326 in words is "twenty-one billion, eight hundred sixteen million, six hundred thirty-four thousand, three hundred twenty-six".