201221221210 has 16 divisors (see below), whose sum is σ = 381261261600. Its totient is φ = 76252252176.

The previous prime is 201221221189. The next prime is 201221221211. The reversal of 201221221210 is 12122122102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (201221221211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 529529340 + ... + 529529719.

It is an arithmetic number, because the mean of its divisors is an integer number (23828828850).

Almost surely, 2^201221221210 is an apocalyptic number.

201221221210 is a deficient number, since it is larger than the sum of its proper divisors (180040040390).

201221221210 is a wasteful number, since it uses less digits than its factorization.

201221221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059059085.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 201221221210 its reverse (12122122102), we get a palindrome (213343343312).

The spelling of 201221221210 in words is "two hundred one billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred ten".