221221101212101 has 16 divisors (see below), whose sum is σ = 239219863259904. Its totient is φ = 203776388053504.

The previous prime is 221221101212057. The next prime is 221221101212159. The reversal of 221221101212101 is 101212101122122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221221101212101 - 2¹³ = 221221101203909 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 (221221101212401) 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, 97121601 + ... + 99373273.

It is an arithmetic number, because the mean of its divisors is an integer number (14951241453744).

Almost surely, 2^{221221101212101} is an apocalyptic number.

It is an amenable number.

221221101212101 is a deficient number, since it is larger than the sum of its proper divisors (17998762047803).

221221101212101 is a wasteful number, since it uses less digits than its factorization.

221221101212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374700.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221221101212101 its reverse (101212101122122), we get a palindrome (322433202334223).

The spelling of 221221101212101 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred one million, two hundred twelve thousand, one hundred one".