221000121001 has 12 divisors (see below), whose sum is σ = 242944192512. Its totient is φ = 200887115000.

The previous prime is 221000120977. The next prime is 221000121077. The reversal of 221000121001 is 100121000122.

221000121001 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 221000121001 - 2²⁹ = 220463250089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221000124001) 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 11 ways as a sum of consecutive naturals, for example, 1060056 + ... + 1251286.

It is an arithmetic number, because the mean of its divisors is an integer number (20245349376).

Almost surely, 2^221000121001 is an apocalyptic number.

It is an amenable number.

221000121001 is a deficient number, since it is larger than the sum of its proper divisors (21944071511).

221000121001 is a wasteful number, since it uses less digits than its factorization.

221000121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200804 (or 200793 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 221000121001 its reverse (100121000122), we get a palindrome (321121121123).

The spelling of 221000121001 in words is "two hundred twenty-one billion, one hundred twenty-one thousand, one".