21365326444 has 24 divisors (see below), whose sum is σ = 46615258368. Its totient is φ = 8324153040.

The previous prime is 21365326441. The next prime is 21365326457. The reversal of 21365326444 is 44462356312.

It is a junction number, because it is equal to n+sod(n) for n = 21365326397 and 21365326406.

It is not an unprimeable number, because it can be changed into a prime (21365326441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34683664 + ... + 34684279.

It is an arithmetic number, because the mean of its divisors is an integer number (1942302432).

Almost surely, 2^21365326444 is an apocalyptic number.

It is an amenable number.

21365326444 is an abundant number, since it is smaller than the sum of its proper divisors (25249931924).

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

21365326444 is a wasteful number, since it uses less digits than its factorization.

21365326444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69367965 (or 69367963 counting only the distinct ones).

The product of its digits is 414720, while the sum is 40.

The spelling of 21365326444 in words is "twenty-one billion, three hundred sixty-five million, three hundred twenty-six thousand, four hundred forty-four".