221244121211 has 4 divisors (see below), whose sum is σ = 222601447272. Its totient is φ = 219886795152.

The previous prime is 221244121171. The next prime is 221244121291. The reversal of 221244121211 is 112121442122.

221244121211 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221244121211 is a prime.

It is a super-2 number, since 2×221244121211² (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 (221244121291) 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, 678662786 + ... + 678663111.

It is an arithmetic number, because the mean of its divisors is an integer number (55650361818).

Almost surely, 2^221244121211 is an apocalyptic number.

221244121211 is a deficient number, since it is larger than the sum of its proper divisors (1357326061).

221244121211 is a wasteful number, since it uses less digits than its factorization.

221244121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357326060.

The product of its digits is 512, while the sum is 23.

Adding to 221244121211 its reverse (112121442122), we get a palindrome (333365563333).

The spelling of 221244121211 in words is "two hundred twenty-one billion, two hundred forty-four million, one hundred twenty-one thousand, two hundred eleven".