221000002011121 has 4 divisors (see below), whose sum is σ = 221000033944692. Its totient is φ = 220999970077552.

The previous prime is 221000002011091. The next prime is 221000002011127. The reversal of 221000002011121 is 121110200000122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 142099774554721 + 78900227456400 = 11920561^2 + 8882580^2 .

It is a cyclic number.

It is not a de Polignac number, because 221000002011121 - 2¹³ = 221000002002929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221000002011127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755086 + ... + 21037351.

It is an arithmetic number, because the mean of its divisors is an integer number (55250008486173).

Almost surely, 2^{221000002011121} is an apocalyptic number.

It is an amenable number.

221000002011121 is a deficient number, since it is larger than the sum of its proper divisors (31933571).

221000002011121 is a wasteful number, since it uses less digits than its factorization.

221000002011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31933570.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221000002011121 its reverse (121110200000122), we get a palindrome (342110202011243).

The spelling of 221000002011121 in words is "two hundred twenty-one trillion, two million, eleven thousand, one hundred twenty-one".