21324331144 has 16 divisors (see below), whose sum is σ = 40056224400. Its totient is φ = 10642671312.

The previous prime is 21324331129. The next prime is 21324331151. The reversal of 21324331144 is 44113342312.

It is a happy number.

It is an unprimeable number.

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, 2432134 + ... + 2440885.

It is an arithmetic number, because the mean of its divisors is an integer number (2503514025).

Almost surely, 2^21324331144 is an apocalyptic number.

It is an amenable number.

21324331144 is a deficient number, since it is larger than the sum of its proper divisors (18731893256).

21324331144 is a wasteful number, since it uses less digits than its factorization.

21324331144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4873572 (or 4873568 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

Adding to 21324331144 its reverse (44113342312), we get a palindrome (65437673456).

The spelling of 21324331144 in words is "twenty-one billion, three hundred twenty-four million, three hundred thirty-one thousand, one hundred forty-four".