21120004352 has 18 divisors (see below), whose sum is σ = 42157509198. Its totient is φ = 10560002048.

The previous prime is 21120004351. The next prime is 21120004361. The reversal of 21120004352 is 25340002112.

It can be written as a sum of positive squares in only one way, i.e., 18863374336 + 2256630016 = 137344^2 + 47504^2 .

It is not an unprimeable number, because it can be changed into a prime (21120004351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41249753 + ... + 41250264.

Almost surely, 2^21120004352 is an apocalyptic number.

It is an amenable number.

21120004352 is a deficient number, since it is larger than the sum of its proper divisors (21037504846).

21120004352 is an frugal number, since it uses more digits than its factorization.

21120004352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82500033 (or 82500019 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21120004352 its reverse (25340002112), we get a palindrome (46460006464).

The spelling of 21120004352 in words is "twenty-one billion, one hundred twenty million, four thousand, three hundred fifty-two".