21221230332 has 12 divisors (see below), whose sum is σ = 49516204136. Its totient is φ = 7073743440.

The previous prime is 21221230319. The next prime is 21221230343. The reversal of 21221230332 is 23303212212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21221230299 and 21221230308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884217919 + ... + 884217942.

Almost surely, 2^21221230332 is an apocalyptic number.

It is an amenable number.

21221230332 is an abundant number, since it is smaller than the sum of its proper divisors (28294973804).

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

21221230332 is a wasteful number, since it uses less digits than its factorization.

21221230332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768435868 (or 1768435866 counting only the distinct ones).

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

Adding to 21221230332 its reverse (23303212212), we get a palindrome (44524442544).

The spelling of 21221230332 in words is "twenty-one billion, two hundred twenty-one million, two hundred thirty thousand, three hundred thirty-two".