221121111211 has 48 divisors (see below), whose sum is σ = 315330478848. Its totient is φ = 152132904000.

The previous prime is 221121111193. The next prime is 221121111259. The reversal of 221121111211 is 112111121122.

It is a de Polignac number, because none of the positive numbers 2^k-221121111211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221121111011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 524865 + ... + 847186.

It is an arithmetic number, because the mean of its divisors is an integer number (6569384976).

Almost surely, 2^221121111211 is an apocalyptic number.

221121111211 is a deficient number, since it is larger than the sum of its proper divisors (94209367637).

221121111211 is a wasteful number, since it uses less digits than its factorization.

221121111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372112 (or 1372105 counting only the distinct ones).

The product of its digits is 16, while the sum is 16.

Adding to 221121111211 its reverse (112111121122), we get a palindrome (333232232333).

It can be divided in two parts, 22 and 1121111211, that multiplied together give a palindrome (24664446642).

The spelling of 221121111211 in words is "two hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, two hundred eleven".