21232321444 has 12 divisors (see below), whose sum is σ = 37273777884. Its totient is φ = 10582670624.

The previous prime is 21232321427. The next prime is 21232321471. The reversal of 21232321444 is 44412323212.

It can be written as a sum of positive squares in 2 ways, for example, as 2274336100 + 18957985344 = 47690^2 + 137688^2 .

It is a super-2 number, since 2×21232321444² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8371099 + ... + 8373634.

It is an arithmetic number, because the mean of its divisors is an integer number (3106148157).

Almost surely, 2^21232321444 is an apocalyptic number.

It is an amenable number.

21232321444 is a deficient number, since it is larger than the sum of its proper divisors (16041456440).

21232321444 is a wasteful number, since it uses less digits than its factorization.

21232321444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16745054 (or 16745052 counting only the distinct ones).

The product of its digits is 9216, while the sum is 28.

Adding to 21232321444 its reverse (44412323212), we get a palindrome (65644644656).

The spelling of 21232321444 in words is "twenty-one billion, two hundred thirty-two million, three hundred twenty-one thousand, four hundred forty-four".