21212303232 has 64 divisors (see below), whose sum is σ = 56361589200. Its totient is φ = 7068708864.

The previous prime is 21212303227. The next prime is 21212303243. The reversal of 21212303232 is 23230321212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21212303199 and 21212303208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1902538 + ... + 1913654.

Almost surely, 2^21212303232 is an apocalyptic number.

It is an amenable number.

21212303232 is an abundant number, since it is smaller than the sum of its proper divisors (35149285968).

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

21212303232 is a wasteful number, since it uses less digits than its factorization.

21212303232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16103 (or 16091 counting only the distinct ones).

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

Adding to 21212303232 its reverse (23230321212), we get a palindrome (44442624444).

The spelling of 21212303232 in words is "twenty-one billion, two hundred twelve million, three hundred three thousand, two hundred thirty-two".