21324430324 has 6 divisors (see below), whose sum is σ = 37317753074. Its totient is φ = 10662215160.

The previous prime is 21324430297. The next prime is 21324430339. The reversal of 21324430324 is 42303442312.

It can be written as a sum of positive squares in only one way, i.e., 21103372900 + 221057424 = 145270^2 + 14868^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21324430292 and 21324430301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2665553787 + ... + 2665553794.

Almost surely, 2^21324430324 is an apocalyptic number.

It is an amenable number.

21324430324 is a deficient number, since it is larger than the sum of its proper divisors (15993322750).

21324430324 is a wasteful number, since it uses less digits than its factorization.

21324430324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5331107585 (or 5331107583 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21324430324 its reverse (42303442312), we get a palindrome (63627872636).

The spelling of 21324430324 in words is "twenty-one billion, three hundred twenty-four million, four hundred thirty thousand, three hundred twenty-four".