21432223144 has 16 divisors (see below), whose sum is σ = 40636941300. Its totient is φ = 10595705472.

The previous prime is 21432223139. The next prime is 21432223151. The reversal of 21432223144 is 44132223412.

It can be written as a sum of positive squares in 2 ways, for example, as 21275723044 + 156500100 = 145862^2 + 12510^2 .

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, 15050007 + ... + 15051430.

Almost surely, 2^21432223144 is an apocalyptic number.

It is an amenable number.

21432223144 is a deficient number, since it is larger than the sum of its proper divisors (19204718156).

21432223144 is a wasteful number, since it uses less digits than its factorization.

21432223144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30101532 (or 30101528 counting only the distinct ones).

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

Adding to 21432223144 its reverse (44132223412), we get a palindrome (65564446556).

The spelling of 21432223144 in words is "twenty-one billion, four hundred thirty-two million, two hundred twenty-three thousand, one hundred forty-four".