21331322220 has 96 divisors (see below), whose sum is σ = 68105838528. Its totient is φ = 4941914112.

The previous prime is 21331322179. The next prime is 21331322261. The reversal of 21331322220 is 2222313312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21331322179) and next prime (21331322261).

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 31 ways as a sum of consecutive naturals, for example, 791089 + ... + 817608.

It is an arithmetic number, because the mean of its divisors is an integer number (709435818).

Almost surely, 2^21331322220 is an apocalyptic number.

21331322220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21331322220 is an abundant number, since it is smaller than the sum of its proper divisors (46774516308).

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

21331322220 is a wasteful number, since it uses less digits than its factorization.

21331322220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608739 (or 1608737 counting only the distinct ones).

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

Adding to 21331322220 its reverse (2222313312), we get a palindrome (23553635532).

The spelling of 21331322220 in words is "twenty-one billion, three hundred thirty-one million, three hundred twenty-two thousand, two hundred twenty".