21320310220 has 24 divisors (see below), whose sum is σ = 48842893008. Its totient is φ = 7752840000.

The previous prime is 21320310217. The next prime is 21320310227. The reversal of 21320310220 is 2201302312.

It is a junction number, because it is equal to n+sod(n) for n = 21320310194 and 21320310203.

It is not an unprimeable number, because it can be changed into a prime (21320310227) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 48455031 + ... + 48455470.

It is an arithmetic number, because the mean of its divisors is an integer number (2035120542).

Almost surely, 2^21320310220 is an apocalyptic number.

21320310220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21320310220 is an abundant number, since it is smaller than the sum of its proper divisors (27522582788).

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

21320310220 is a wasteful number, since it uses less digits than its factorization.

21320310220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96910521 (or 96910519 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21320310220 its reverse (2201302312), we get a palindrome (23521612532).

The spelling of 21320310220 in words is "twenty-one billion, three hundred twenty million, three hundred ten thousand, two hundred twenty".