201221012101 has 16 divisors (see below), whose sum is σ = 204469171200.
Its totient is φ = 197991441648.
The previous prime is 201221012093. The next prime is 201221012117. The reversal of 201221012101 is 101210122102.
Adding to 201221012101 its reverse (101210122102), we get a palindrome (302431134203).
It is a cyclic number.
It is not a de Polignac number, because 201221012101 - 23 = 201221012093 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (201221012141) 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, 38493850 + ... + 38499076.
It is an arithmetic number, because the mean of its divisors is an integer number (12779323200).
Almost surely, 2201221012101 is an apocalyptic number.
It is an amenable number.
201221012101 is a deficient number, since it is larger than the sum of its proper divisors (3248159099).
201221012101 is a wasteful number, since it uses less digits than its factorization.
201221012101 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 6888.
The product of its (nonzero) digits is 16, while the sum is 13.
The spelling of 201221012101 in words is "two hundred one billion, two hundred twenty-one million, twelve thousand, one hundred one".