201221199980 has 12 divisors (see below), whose sum is σ = 422564520000. Its totient is φ = 80488479984.

The previous prime is 201221199979. The next prime is 201221200051. The reversal of 201221199980 is 89991122102.

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, 5030529980 + ... + 5030530019.

It is an arithmetic number, because the mean of its divisors is an integer number (35213710000).

Almost surely, 2^201221199980 is an apocalyptic number.

201221199980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221199980 is an abundant number, since it is smaller than the sum of its proper divisors (221343320020).

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

201221199980 is a wasteful number, since it uses less digits than its factorization.

201221199980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10061060008 (or 10061060006 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 44.

The spelling of 201221199980 in words is "two hundred one billion, two hundred twenty-one million, one hundred ninety-nine thousand, nine hundred eighty".