221221202020101 has 12 divisors (see below), whose sum is σ = 327335437135980. Its totient is φ = 143883708630720.

The previous prime is 221221202020009. The next prime is 221221202020123. The reversal of 221221202020101 is 101020202122122.

It is a happy number.

221221202020101 is a `hidden beast` number, since 221 + 22 + 120 + 202 + 0 + 101 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18746942891076 + 202474259129025 = 4329774^2 + 14229345^2 .

It is not a de Polignac number, because 221221202020101 - 2⁷ = 221221202019973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221202020141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 299757725946 + ... + 299757726683.

It is an arithmetic number, because the mean of its divisors is an integer number (27277953094665).

Almost surely, 2^{221221202020101} is an apocalyptic number.

It is an amenable number.

221221202020101 is a deficient number, since it is larger than the sum of its proper divisors (106114235115879).

221221202020101 is a wasteful number, since it uses less digits than its factorization.

221221202020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599515452676 (or 599515452673 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221221202020101 its reverse (101020202122122), we get a palindrome (322241404142223).

The spelling of 221221202020101 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, twenty thousand, one hundred one".