111311101221 has 16 divisors (see below), whose sum is σ = 151326480960. Its totient is φ = 72753624320.

The previous prime is 111311101193. The next prime is 111311101271. The reversal of 111311101221 is 122101113111.

It is a cyclic number.

It is not a de Polignac number, because 111311101221 - 2⁹ = 111311100709 is a prime.

It is a super-2 number, since 2×111311101221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111311101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111311101271) 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 15 ways as a sum of consecutive naturals, for example, 40791 + ... + 473588.

It is an arithmetic number, because the mean of its divisors is an integer number (9457905060).

Almost surely, 2^111311101221 is an apocalyptic number.

It is an amenable number.

111311101221 is a deficient number, since it is larger than the sum of its proper divisors (40015379739).

111311101221 is a wasteful number, since it uses less digits than its factorization.

111311101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515796.

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 111311101221 its reverse (122101113111), we get a palindrome (233412214332).

The spelling of 111311101221 in words is "one hundred eleven billion, three hundred eleven million, one hundred one thousand, two hundred twenty-one".