21220233030 has 96 divisors (see below), whose sum is σ = 58111223040. Its totient is φ = 5357689920.

The previous prime is 21220232987. The next prime is 21220233031. The reversal of 21220233030 is 3033202212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21220232994 and 21220233012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220233031) 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 47 ways as a sum of consecutive naturals, for example, 4325559 + ... + 4330461.

It is an arithmetic number, because the mean of its divisors is an integer number (605325240).

Almost surely, 2^21220233030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220233030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29055611520).

21220233030 is an abundant number, since it is smaller than the sum of its proper divisors (36890990010).

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

21220233030 is a wasteful number, since it uses less digits than its factorization.

21220233030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7466 (or 7463 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21220233030 its reverse (3033202212), we get a palindrome (24253435242).

The spelling of 21220233030 in words is "twenty-one billion, two hundred twenty million, two hundred thirty-three thousand, thirty".