3111211221 has 8 divisors (see below), whose sum is σ = 4366612320. Its totient is φ = 1964975472.

The previous prime is 3111211199. The next prime is 3111211223. The reversal of 3111211221 is 1221121113.

3111211221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3111211221 - 2¹⁸ = 3110949077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3111211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3111211223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27291270 + ... + 27291383.

It is an arithmetic number, because the mean of its divisors is an integer number (545826540).

Almost surely, 2^3111211221 is an apocalyptic number.

It is an amenable number.

3111211221 is a deficient number, since it is larger than the sum of its proper divisors (1255401099).

3111211221 is a wasteful number, since it uses less digits than its factorization.

3111211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54582675.

The product of its digits is 24, while the sum is 15.

The square root of 3111211221 is about 55778.2325015772. The cubic root of 3111211221 is about 1459.8553714557.

Adding to 3111211221 its reverse (1221121113), we get a palindrome (4332332334).

The spelling of 3111211221 in words is "three billion, one hundred eleven million, two hundred eleven thousand, two hundred twenty-one".