21231143144 has 16 divisors (see below), whose sum is σ = 39817512900. Its totient is φ = 10613139712.

The previous prime is 21231143093. The next prime is 21231143159. The reversal of 21231143144 is 44134113212.

It can be written as a sum of positive squares in 2 ways, for example, as 21138252100 + 92891044 = 145390^2 + 9638^2 .

It is a super-2 number, since 2×21231143144² (a number of 21 digits) contains 22 as substring.

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, 266609 + ... + 336960.

Almost surely, 2^21231143144 is an apocalyptic number.

It is an amenable number.

21231143144 is a deficient number, since it is larger than the sum of its proper divisors (18586369756).

21231143144 is a wasteful number, since it uses less digits than its factorization.

21231143144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607972 (or 607968 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

Adding to 21231143144 its reverse (44134113212), we get a palindrome (65365256356).

The spelling of 21231143144 in words is "twenty-one billion, two hundred thirty-one million, one hundred forty-three thousand, one hundred forty-four".