21204130324 has 24 divisors (see below), whose sum is σ = 41250718208. Its totient is φ = 9470826720.

The previous prime is 21204130291. The next prime is 21204130369. The reversal of 21204130324 is 42303140212.

It is a junction number, because it is equal to n+sod(n) for n = 21204130295 and 21204130304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6575352 + ... + 6578575.

Almost surely, 2^21204130324 is an apocalyptic number.

It is an amenable number.

21204130324 is a deficient number, since it is larger than the sum of its proper divisors (20046587884).

21204130324 is a wasteful number, since it uses less digits than its factorization.

21204130324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13153975 (or 13153973 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21204130324 its reverse (42303140212), we get a palindrome (63507270536).

The spelling of 21204130324 in words is "twenty-one billion, two hundred four million, one hundred thirty thousand, three hundred twenty-four".