21331305222 has 32 divisors (see below), whose sum is σ = 43007687424. Its totient is φ = 7053060000.

The previous prime is 21331305209. The next prime is 21331305239. The reversal of 21331305222 is 22250313312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21331305192 and 21331305201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 618313 + ... + 651899.

It is an arithmetic number, because the mean of its divisors is an integer number (1343990232).

Almost surely, 2^21331305222 is an apocalyptic number.

21331305222 is an abundant number, since it is smaller than the sum of its proper divisors (21676382202).

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

21331305222 is a wasteful number, since it uses less digits than its factorization.

21331305222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34444.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21331305222 its reverse (22250313312), we get a palindrome (43581618534).

The spelling of 21331305222 in words is "twenty-one billion, three hundred thirty-one million, three hundred five thousand, two hundred twenty-two".