311111112222221 has 16 divisors (see below), whose sum is σ = 312555396628800. Its totient is φ = 309670230135168.

The previous prime is 311111112222149. The next prime is 311111112222233. The reversal of 311111112222221 is 122222211111113.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311111112222221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311111112222271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6305557370 + ... + 6305606708.

It is an arithmetic number, because the mean of its divisors is an integer number (19534712289300).

Almost surely, 2^{311111112222221} is an apocalyptic number.

It is an amenable number.

311111112222221 is a deficient number, since it is larger than the sum of its proper divisors (1444284406579).

311111112222221 is a wasteful number, since it uses less digits than its factorization.

311111112222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83228.

The product of its digits is 192, while the sum is 23.

Adding to 311111112222221 its reverse (122222211111113), we get a palindrome (433333323333334).

The spelling of 311111112222221 in words is "three hundred eleven trillion, one hundred eleven billion, one hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".