221021320120 has 16 divisors (see below), whose sum is σ = 497297970360. Its totient is φ = 88408528032.

The previous prime is 221021320073. The next prime is 221021320133. The reversal of 221021320120 is 21023120122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221021320094 and 221021320103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2762766462 + ... + 2762766541.

Almost surely, 2^221021320120 is an apocalyptic number.

221021320120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221021320120 is an abundant number, since it is smaller than the sum of its proper divisors (276276650240).

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

221021320120 is a wasteful number, since it uses less digits than its factorization.

221021320120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5525533014 (or 5525533010 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 221021320120 its reverse (21023120122), we get a palindrome (242044440242).

The spelling of 221021320120 in words is "two hundred twenty-one billion, twenty-one million, three hundred twenty thousand, one hundred twenty".