221021221102121 has 12 divisors (see below), whose sum is σ = 242941715520000. Its totient is φ = 200927527240440.

The previous prime is 221021221102061. The next prime is 221021221102151. The reversal of 221021221102121 is 121201122120122.

It is a de Polignac number, because none of the positive numbers 2^k-221021221102121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221021221102093 and 221021221102102.

It is not an unprimeable number, because it can be changed into a prime (221021221102151) 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, 25562480 + ... + 33098078.

It is an arithmetic number, because the mean of its divisors is an integer number (20245142960000).

Almost surely, 2^{221021221102121} is an apocalyptic number.

It is an amenable number.

221021221102121 is a deficient number, since it is larger than the sum of its proper divisors (21920494417879).

221021221102121 is a wasteful number, since it uses less digits than its factorization.

221021221102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7778020 (or 7778009 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221021221102121 its reverse (121201122120122), we get a palindrome (342222343222243).

The spelling of 221021221102121 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, one hundred two thousand, one hundred twenty-one".