21200222232 has 256 divisors, whose sum is σ = 72922291200. Its totient is φ = 5568030720.

The previous prime is 21200222213. The next prime is 21200222237. The reversal of 21200222232 is 23222200212.

21200222232 is a `hidden beast` number, since 212 + 0 + 0 + 222 + 232 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200222237) 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 63 ways as a sum of consecutive naturals, for example, 1095682 + ... + 1114862.

It is an arithmetic number, because the mean of its divisors is an integer number (284852700).

Almost surely, 2^21200222232 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 21200222232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36461145600).

21200222232 is an abundant number, since it is smaller than the sum of its proper divisors (51722068968).

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

21200222232 is a wasteful number, since it uses less digits than its factorization.

21200222232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19263 (or 19253 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21200222232 its reverse (23222200212), we get a palindrome (44422422444).

The spelling of 21200222232 in words is "twenty-one billion, two hundred million, two hundred twenty-two thousand, two hundred thirty-two".