111021100111221 has 4 divisors (see below), whose sum is σ = 148028133481632. Its totient is φ = 74014066740812.

The previous prime is 111021100111217. The next prime is 111021100111279. The reversal of 111021100111221 is 122111001120111.

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 not a de Polignac number, because 111021100111221 - 2² = 111021100111217 is a prime.

It is a super-2 number, since 2×111021100111221² (a number of 29 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 111021100111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021100111321) 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, 18503516685201 + ... + 18503516685206.

It is an arithmetic number, because the mean of its divisors is an integer number (37007033370408).

Almost surely, 2^{111021100111221} is an apocalyptic number.

It is an amenable number.

111021100111221 is a deficient number, since it is larger than the sum of its proper divisors (37007033370411).

111021100111221 is an equidigital number, since it uses as much as digits as its factorization.

111021100111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37007033370410.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 111021100111221 its reverse (122111001120111), we get a palindrome (233132101231332).

The spelling of 111021100111221 in words is "one hundred eleven trillion, twenty-one billion, one hundred million, one hundred eleven thousand, two hundred twenty-one".