111031213221 has 12 divisors (see below), whose sum is σ = 160387072300. Its totient is φ = 74016815040.

The previous prime is 111031213201. The next prime is 111031213247. The reversal of 111031213221 is 122312130111.

It can be written as a sum of positive squares in 2 ways, for example, as 9500400900 + 101530812321 = 97470^2 + 318639^2 .

It is not a de Polignac number, because 111031213221 - 2¹⁹ = 111030688933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111031213194 and 111031213203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111031213201) 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 11 ways as a sum of consecutive naturals, for example, 151546 + ... + 495003.

Almost surely, 2^111031213221 is an apocalyptic number.

It is an amenable number.

111031213221 is a deficient number, since it is larger than the sum of its proper divisors (49355859079).

111031213221 is a wasteful number, since it uses less digits than its factorization.

111031213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665636 (or 665633 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 111031213221 its reverse (122312130111), we get a palindrome (233343343332).

The spelling of 111031213221 in words is "one hundred eleven billion, thirty-one million, two hundred thirteen thousand, two hundred twenty-one".