201221200050 has 48 divisors (see below), whose sum is σ = 537415394880. Its totient is φ = 49531371840.

The previous prime is 201221199979. The next prime is 201221200051. The reversal of 201221200050 is 50002122102.

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

It is not an unprimeable number, because it can be changed into a prime (201221200051) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 51593230 + ... + 51597129.

It is an arithmetic number, because the mean of its divisors is an integer number (11196154060).

Almost surely, 2^201221200050 is an apocalyptic number.

201221200050 is an abundant number, since it is smaller than the sum of its proper divisors (336194194830).

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

201221200050 is a wasteful number, since it uses less digits than its factorization.

201221200050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103190387 (or 103190382 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 201221200050 its reverse (50002122102), we get a palindrome (251223322152).

The spelling of 201221200050 in words is "two hundred one billion, two hundred twenty-one million, two hundred thousand, fifty".