21324444124 has 12 divisors (see below), whose sum is σ = 37354769200. Its totient is φ = 10651652928.

The previous prime is 21324444103. The next prime is 21324444131. The reversal of 21324444124 is 42144442312.

It is a happy number.

It is a congruent number.

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, 2637744 + ... + 2645815.

Almost surely, 2^21324444124 is an apocalyptic number.

It is an amenable number.

21324444124 is a deficient number, since it is larger than the sum of its proper divisors (16030325076).

21324444124 is a wasteful number, since it uses less digits than its factorization.

21324444124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5284572 (or 5284570 counting only the distinct ones).

The product of its digits is 24576, while the sum is 31.

Adding to 21324444124 its reverse (42144442312), we get a palindrome (63468886436).

The spelling of 21324444124 in words is "twenty-one billion, three hundred twenty-four million, four hundred forty-four thousand, one hundred twenty-four".