21031232232 has 32 divisors (see below), whose sum is σ = 53800829280. Its totient is φ = 6847377600.

The previous prime is 21031232227. The next prime is 21031232237. The reversal of 21031232232 is 23223213012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21031232227) and next prime (21031232237).

It is a junction number, because it is equal to n+sod(n) for n = 21031232199 and 21031232208.

It is not an unprimeable number, because it can be changed into a prime (21031232237) 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 7 ways as a sum of consecutive naturals, for example, 10188519 + ... + 10190582.

It is an arithmetic number, because the mean of its divisors is an integer number (1681275915).

Almost surely, 2^21031232232 is an apocalyptic number.

It is an amenable number.

21031232232 is an abundant number, since it is smaller than the sum of its proper divisors (32769597048).

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

21031232232 is a wasteful number, since it uses less digits than its factorization.

21031232232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20379153 (or 20379149 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21031232232 its reverse (23223213012), we get a palindrome (44254445244).

The spelling of 21031232232 in words is "twenty-one billion, thirty-one million, two hundred thirty-two thousand, two hundred thirty-two".