21221232232 has 32 divisors (see below), whose sum is σ = 40025711880. Its totient is φ = 10547896320.

The previous prime is 21221232223. The next prime is 21221232239. The reversal of 21221232232 is 23223212212.

It can be written as a sum of positive squares in 4 ways, for example, as 10793963236 + 10427268996 = 103894^2 + 102114^2 .

It is not an unprimeable number, because it can be changed into a prime (21221232239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 922632 + ... + 945352.

Almost surely, 2^21221232232 is an apocalyptic number.

It is an amenable number.

21221232232 is a deficient number, since it is larger than the sum of its proper divisors (18804479648).

21221232232 is a wasteful number, since it uses less digits than its factorization.

21221232232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23413 (or 23409 counting only the distinct ones).

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

Adding to 21221232232 its reverse (23223212212), we get a palindrome (44444444444).

The spelling of 21221232232 in words is "twenty-one billion, two hundred twenty-one million, two hundred thirty-two thousand, two hundred thirty-two".