111021111221 has 8 divisors (see below), whose sum is σ = 114492231000. Its totient is φ = 107586338560.

The previous prime is 111021111203. The next prime is 111021111259. The reversal of 111021111221 is 122111120111.

It can be written as a sum of positive squares in 4 ways, for example, as 3200164900 + 107820946321 = 56570^2 + 328361^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111021111221 - 2²² = 111016916917 is a prime.

It is a super-2 number, since 2×111021111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111021111196 and 111021111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021111281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9080576 + ... + 9092793.

It is an arithmetic number, because the mean of its divisors is an integer number (14311528875).

Almost surely, 2^111021111221 is an apocalyptic number.

It is an amenable number.

111021111221 is a deficient number, since it is larger than the sum of its proper divisors (3471119779).

111021111221 is a wasteful number, since it uses less digits than its factorization.

111021111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18173559.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 111021111221 its reverse (122111120111), we get a palindrome (233132231332).

The spelling of 111021111221 in words is "one hundred eleven billion, twenty-one million, one hundred eleven thousand, two hundred twenty-one".