21313404324 has 18 divisors (see below), whose sum is σ = 53875549910. Its totient is φ = 7104468096.

The previous prime is 21313404313. The next prime is 21313404341. The reversal of 21313404324 is 42340431312.

21313404324 is a `hidden beast` number, since 21 + 313 + 4 + 0 + 4 + 324 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18714240000 + 2599164324 = 136800^2 + 50982^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×21313404324² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 296019469 + ... + 296019540.

Almost surely, 2^21313404324 is an apocalyptic number.

It is an amenable number.

21313404324 is an abundant number, since it is smaller than the sum of its proper divisors (32562145586).

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

21313404324 is a wasteful number, since it uses less digits than its factorization.

21313404324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592039019 (or 592039014 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21313404324 its reverse (42340431312), we get a palindrome (63653835636).

The spelling of 21313404324 in words is "twenty-one billion, three hundred thirteen million, four hundred four thousand, three hundred twenty-four".