221211002121 has 32 divisors (see below), whose sum is σ = 308279347200. Its totient is φ = 140952945600.

The previous prime is 221211002071. The next prime is 221211002141. The reversal of 221211002121 is 121200112122.

It is not a de Polignac number, because 221211002121 - 2¹⁰ = 221211001097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221211002121.

It is not an unprimeable number, because it can be changed into a prime (221211002141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9490960 + ... + 9514238.

It is an arithmetic number, because the mean of its divisors is an integer number (9633729600).

Almost surely, 2^221211002121 is an apocalyptic number.

It is an amenable number.

221211002121 is a deficient number, since it is larger than the sum of its proper divisors (87068345079).

221211002121 is a wasteful number, since it uses less digits than its factorization.

221211002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24829.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221211002121 its reverse (121200112122), we get a palindrome (342411114243).

The spelling of 221211002121 in words is "two hundred twenty-one billion, two hundred eleven million, two thousand, one hundred twenty-one".