201221031211101 has 24 divisors (see below), whose sum is σ = 320344384598784. Its totient is φ = 120694901564160.

The previous prime is 201221031211091. The next prime is 201221031211201. The reversal of 201221031211101 is 101112130122102.

It is a happy number.

201221031211101 is a `hidden beast` number, since 20 + 1 + 221 + 0 + 312 + 1 + 110 + 1 = 666.

It is not a de Polignac number, because 201221031211101 - 2⁵ = 201221031211069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221031211201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10476978381 + ... + 10476997586.

It is an arithmetic number, because the mean of its divisors is an integer number (13347682691616).

Almost surely, 2^{201221031211101} is an apocalyptic number.

It is an amenable number.

201221031211101 is a deficient number, since it is larger than the sum of its proper divisors (119123353387683).

201221031211101 is a wasteful number, since it uses less digits than its factorization.

201221031211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20953976081 (or 20953976078 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 201221031211101 its reverse (101112130122102), we get a palindrome (302333161333203).

The spelling of 201221031211101 in words is "two hundred one trillion, two hundred twenty-one billion, thirty-one million, two hundred eleven thousand, one hundred one".