21313204044 has 96 divisors (see below), whose sum is σ = 55869386496. Its totient is φ = 6267905280.

The previous prime is 21313204043. The next prime is 21313204051. The reversal of 21313204044 is 44040231312.

It is not an unprimeable number, because it can be changed into a prime (21313204043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 879174 + ... + 903090.

It is an arithmetic number, because the mean of its divisors is an integer number (581972776).

Almost surely, 2^21313204044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21313204044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27934693248).

21313204044 is an abundant number, since it is smaller than the sum of its proper divisors (34556182452).

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

21313204044 is a wasteful number, since it uses less digits than its factorization.

21313204044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24135 (or 24133 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21313204044 its reverse (44040231312), we get a palindrome (65353435356).

The spelling of 21313204044 in words is "twenty-one billion, three hundred thirteen million, two hundred four thousand, forty-four".