221001111121 has 4 divisors (see below), whose sum is σ = 252572698432. Its totient is φ = 189429523812.

The previous prime is 221001111109. The next prime is 221001111139. The reversal of 221001111121 is 121111100122.

It is a happy number.

221001111121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221001111121 - 2⁹ = 221001110609 is a prime.

It is a super-2 number, since 2×221001111121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221001111521) 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 3 ways as a sum of consecutive naturals, for example, 15785793645 + ... + 15785793658.

It is an arithmetic number, because the mean of its divisors is an integer number (63143174608).

Almost surely, 2^221001111121 is an apocalyptic number.

It is an amenable number.

221001111121 is a deficient number, since it is larger than the sum of its proper divisors (31571587311).

221001111121 is an equidigital number, since it uses as much as digits as its factorization.

221001111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31571587310.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221001111121 its reverse (121111100122), we get a palindrome (342112211243).

The spelling of 221001111121 in words is "two hundred twenty-one billion, one million, one hundred eleven thousand, one hundred twenty-one".