201221200121000 has 64 divisors (see below), whose sum is σ = 476817831360000. Its totient is φ = 79469638497600.

The previous prime is 201221200120957. The next prime is 201221200121003. The reversal of 201221200121000 is 121002122102.

It is not an unprimeable number, because it can be changed into a prime (201221200121003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1273472900 + ... + 1273630899.

It is an arithmetic number, because the mean of its divisors is an integer number (7450278615000).

Almost surely, 2^{201221200121000} is an apocalyptic number.

201221200121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201221200121000 is an abundant number, since it is smaller than the sum of its proper divisors (275596631239000).

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

201221200121000 is a wasteful number, since it uses less digits than its factorization.

201221200121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547103899 (or 2547103885 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201221200121000 its reverse (121002122102), we get a palindrome (201342202243102).

The spelling of 201221200121000 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred million, one hundred twenty-one thousand".