21323223232 has 28 divisors (see below), whose sum is σ = 42823080216. Its totient is φ = 10533155840.

The previous prime is 21323223193. The next prime is 21323223253. The reversal of 21323223232 is 23232232312.

It is a junction number, because it is equal to n+sod(n) for n = 21323223197 and 21323223206.

It is an unprimeable number.

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, 2001769 + ... + 2012392.

It is an arithmetic number, because the mean of its divisors is an integer number (1529395722).

Almost surely, 2^21323223232 is an apocalyptic number.

It is an amenable number.

21323223232 is an abundant number, since it is smaller than the sum of its proper divisors (21499856984).

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

21323223232 is an equidigital number, since it uses as much as digits as its factorization.

21323223232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4014256 (or 4014246 counting only the distinct ones).

The product of its digits is 5184, while the sum is 25.

Adding to 21323223232 its reverse (23232232312), we get a palindrome (44555455544).

The spelling of 21323223232 in words is "twenty-one billion, three hundred twenty-three million, two hundred twenty-three thousand, two hundred thirty-two".