221201002120 has 32 divisors (see below), whose sum is σ = 568802577600. Its totient is φ = 75840343488.

The previous prime is 221201002109. The next prime is 221201002151. The reversal of 221201002120 is 21200102122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221201002120.

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, 395001510 + ... + 395002069.

It is an arithmetic number, because the mean of its divisors is an integer number (17775080550).

Almost surely, 2^221201002120 is an apocalyptic number.

221201002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201002120 is an abundant number, since it is smaller than the sum of its proper divisors (347601575480).

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

221201002120 is a wasteful number, since it uses less digits than its factorization.

221201002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790003597 (or 790003593 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221201002120 its reverse (21200102122), we get a palindrome (242401104242).

The spelling of 221201002120 in words is "two hundred twenty-one billion, two hundred one million, two thousand, one hundred twenty".