221100202121 has 8 divisors (see below), whose sum is σ = 222275047680. Its totient is φ = 219926994192.

The previous prime is 221100202091. The next prime is 221100202201. The reversal of 221100202121 is 121202001122.

221100202121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221100202121 - 2²⁶ = 221033093257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221100202096 and 221100202105.

It is not an unprimeable number, because it can be changed into a prime (221100202621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138191 + ... + 679188.

It is an arithmetic number, because the mean of its divisors is an integer number (27784380960).

Almost surely, 2^221100202121 is an apocalyptic number.

It is an amenable number.

221100202121 is a deficient number, since it is larger than the sum of its proper divisors (1174845559).

221100202121 is a wasteful number, since it uses less digits than its factorization.

221100202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818815.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221100202121 its reverse (121202001122), we get a palindrome (342302203243).

The spelling of 221100202121 in words is "two hundred twenty-one billion, one hundred million, two hundred two thousand, one hundred twenty-one".