21322012044 has 12 divisors (see below), whose sum is σ = 49751361464. Its totient is φ = 7107337344.

The previous prime is 21322012043. The next prime is 21322012111. The reversal of 21322012044 is 44021022312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21322012044.

It is not an unprimeable number, because it can be changed into a prime (21322012043) 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 3 ways as a sum of consecutive naturals, for example, 888417157 + ... + 888417180.

Almost surely, 2^21322012044 is an apocalyptic number.

It is an amenable number.

21322012044 is an abundant number, since it is smaller than the sum of its proper divisors (28429349420).

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

21322012044 is a wasteful number, since it uses less digits than its factorization.

21322012044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776834344 (or 1776834342 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21322012044 its reverse (44021022312), we get a palindrome (65343034356).

The spelling of 21322012044 in words is "twenty-one billion, three hundred twenty-two million, twelve thousand, forty-four".