21230431144 has 64 divisors (see below), whose sum is σ = 43729358400. Its totient is φ = 9603062784.

The previous prime is 21230431097. The next prime is 21230431153. The reversal of 21230431144 is 44113403212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2062699 + ... + 2072965.

It is an arithmetic number, because the mean of its divisors is an integer number (683271225).

Almost surely, 2^21230431144 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 21230431144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21864679200).

21230431144 is an abundant number, since it is smaller than the sum of its proper divisors (22498927256).

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

21230431144 is a wasteful number, since it uses less digits than its factorization.

21230431144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10682 (or 10678 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21230431144 its reverse (44113403212), we get a palindrome (65343834356).

The spelling of 21230431144 in words is "twenty-one billion, two hundred thirty million, four hundred thirty-one thousand, one hundred forty-four".