21220230332 has 48 divisors (see below), whose sum is σ = 44886132480. Its totient is φ = 8574854400.

The previous prime is 21220230299. The next prime is 21220230341. The reversal of 21220230332 is 23303202212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17732 + ... + 206772.

It is an arithmetic number, because the mean of its divisors is an integer number (935127760).

Almost surely, 2^21220230332 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220230332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22443066240).

21220230332 is an abundant number, since it is smaller than the sum of its proper divisors (23665902148).

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

21220230332 is a wasteful number, since it uses less digits than its factorization.

21220230332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189282 (or 189280 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21220230332 its reverse (23303202212), we get a palindrome (44523432544).

The spelling of 21220230332 in words is "twenty-one billion, two hundred twenty million, two hundred thirty thousand, three hundred thirty-two".