111211222110221 has 4 divisors (see below), whose sum is σ = 111260892153600. Its totient is φ = 111161552066844.

The previous prime is 111211222110211. The next prime is 111211222110269. The reversal of 111211222110221 is 122011222112111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111211222110221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111211222110193 and 111211222110202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211222110211) 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 3 ways as a sum of consecutive naturals, for example, 24835018331 + ... + 24835022808.

It is an arithmetic number, because the mean of its divisors is an integer number (27815223038400).

Almost surely, 2^{111211222110221} is an apocalyptic number.

It is an amenable number.

111211222110221 is a deficient number, since it is larger than the sum of its proper divisors (49670043379).

111211222110221 is an equidigital number, since it uses as much as digits as its factorization.

111211222110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49670043378.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111211222110221 its reverse (122011222112111), we get a palindrome (233222444222332).

The spelling of 111211222110221 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred twenty-two million, one hundred ten thousand, two hundred twenty-one".