221001110202121 has 16 divisors (see below), whose sum is σ = 234116223866560. Its totient is φ = 208034363983680.

The previous prime is 221001110202079. The next prime is 221001110202149. The reversal of 221001110202121 is 121202011100122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221001110202121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221001110202095 and 221001110202104.

It is not an unprimeable number, because it can be changed into a prime (221001110202151) 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, 700283455 + ... + 700598971.

It is an arithmetic number, because the mean of its divisors is an integer number (14632263991660).

Almost surely, 2^{221001110202121} is an apocalyptic number.

It is an amenable number.

221001110202121 is a deficient number, since it is larger than the sum of its proper divisors (13115113664439).

221001110202121 is a wasteful number, since it uses less digits than its factorization.

221001110202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550504.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221001110202121 its reverse (121202011100122), we get a palindrome (342203121302243).

The spelling of 221001110202121 in words is "two hundred twenty-one trillion, one billion, one hundred ten million, two hundred two thousand, one hundred twenty-one".