21220320120 has 32 divisors (see below), whose sum is σ = 63660960720. Its totient is φ = 5658752000.

The previous prime is 21220320109. The next prime is 21220320151. The reversal of 21220320120 is 2102302212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21220320120.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 88417881 + ... + 88418120.

Almost surely, 2^21220320120 is an apocalyptic number.

21220320120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220320120 is an abundant number, since it is smaller than the sum of its proper divisors (42440640600).

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

21220320120 is a wasteful number, since it uses less digits than its factorization.

21220320120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176836015 (or 176836011 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21220320120 its reverse (2102302212), we get a palindrome (23322622332).

The spelling of 21220320120 in words is "twenty-one billion, two hundred twenty million, three hundred twenty thousand, one hundred twenty".