21220320108 has 192 divisors, whose sum is σ = 57610828800. Its totient is φ = 6021120000.

The previous prime is 21220320097. The next prime is 21220320109. The reversal of 21220320108 is 80102302212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21220320109) 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, 47261068 + ... + 47261516.

It is an arithmetic number, because the mean of its divisors is an integer number (300056400).

Almost surely, 2^21220320108 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 21220320108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28805414400).

21220320108 is an abundant number, since it is smaller than the sum of its proper divisors (36390508692).

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

21220320108 is a wasteful number, since it uses less digits than its factorization.

21220320108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808 (or 806 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The spelling of 21220320108 in words is "twenty-one billion, two hundred twenty million, three hundred twenty thousand, one hundred eight".