111211102222221 has 4 divisors (see below), whose sum is σ = 148281469629632. Its totient is φ = 74140734814812.

The previous prime is 111211102222159. The next prime is 111211102222223. The reversal of 111211102222221 is 122222201112111.

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 not a de Polignac number, because 111211102222221 - 2²² = 111211098027917 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 (111211102222223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18535183703701 + ... + 18535183703706.

It is an arithmetic number, because the mean of its divisors is an integer number (37070367407408).

Almost surely, 2^{111211102222221} is an apocalyptic number.

It is an amenable number.

111211102222221 is a deficient number, since it is larger than the sum of its proper divisors (37070367407411).

111211102222221 is an equidigital number, since it uses as much as digits as its factorization.

111211102222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37070367407410.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 111211102222221 its reverse (122222201112111), we get a palindrome (233433303334332).

The spelling of 111211102222221 in words is "one hundred eleven trillion, two hundred eleven billion, one hundred two million, two hundred twenty-two thousand, two hundred twenty-one".