201221211231221 has 16 divisors (see below), whose sum is σ = 213303946363200. Its totient is φ = 189531687945600.

The previous prime is 201221211231203. The next prime is 201221211231251. The reversal of 201221211231221 is 122132112122102.

It is a de Polignac number, because none of the positive numbers 2^k-201221211231221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221211231251) 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, 448647800 + ... + 449096081.

It is an arithmetic number, because the mean of its divisors is an integer number (13331496647700).

Almost surely, 2^{201221211231221} is an apocalyptic number.

It is an amenable number.

201221211231221 is a deficient number, since it is larger than the sum of its proper divisors (12082735131979).

201221211231221 is a wasteful number, since it uses less digits than its factorization.

201221211231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897744100.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 201221211231221 its reverse (122132112122102), we get a palindrome (323353323353323).

The spelling of 201221211231221 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred thirty-one thousand, two hundred twenty-one".