221201101220121 has 80 divisors (see below), whose sum is σ = 364432693743360. Its totient is φ = 132593775901920.

The previous prime is 221201101220117. The next prime is 221201101220123. The reversal of 221201101220121 is 121022101102122.

221201101220121 is a `hidden beast` number, since 2 + 21 + 201 + 101 + 220 + 121 = 666.

221201101220121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221201101220121 - 2² = 221201101220117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221201101220094 and 221201101220103.

It is not an unprimeable number, because it can be changed into a prime (221201101220123) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 57139450 + ... + 60887756.

It is an arithmetic number, because the mean of its divisors is an integer number (4555408671792).

Almost surely, 2^{221201101220121} is an apocalyptic number.

It is an amenable number.

221201101220121 is a deficient number, since it is larger than the sum of its proper divisors (143231592523239).

221201101220121 is a wasteful number, since it uses less digits than its factorization.

221201101220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3749056 (or 3749047 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221201101220121 its reverse (121022101102122), we get a palindrome (342223202322243).

The spelling of 221201101220121 in words is "two hundred twenty-one trillion, two hundred one billion, one hundred one million, two hundred twenty thousand, one hundred twenty-one".