21201232232 has 16 divisors (see below), whose sum is σ = 41844537600. Its totient is φ = 10042688880.

The previous prime is 21201232231. The next prime is 21201232271. The reversal of 21201232232 is 23223210212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21201232231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69740744 + ... + 69741047.

It is an arithmetic number, because the mean of its divisors is an integer number (2615283600).

Almost surely, 2^21201232232 is an apocalyptic number.

It is an amenable number.

21201232232 is a deficient number, since it is larger than the sum of its proper divisors (20643305368).

21201232232 is a wasteful number, since it uses less digits than its factorization.

21201232232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139481816 (or 139481812 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21201232232 its reverse (23223210212), we get a palindrome (44424442444).

The spelling of 21201232232 in words is "twenty-one billion, two hundred one million, two hundred thirty-two thousand, two hundred thirty-two".