111211002221 has 4 divisors (see below), whose sum is σ = 121321093344. Its totient is φ = 101100911100.

The previous prime is 111211002151. The next prime is 111211002257. The reversal of 111211002221 is 122200112111.

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 111211002221 - 2¹⁰ = 111211001197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111211002196 and 111211002205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211004221) 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, 5055045545 + ... + 5055045566.

It is an arithmetic number, because the mean of its divisors is an integer number (30330273336).

Almost surely, 2^111211002221 is an apocalyptic number.

111211002221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111211002221 is a deficient number, since it is larger than the sum of its proper divisors (10110091123).

111211002221 is a wasteful number, since it uses less digits than its factorization.

111211002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10110091122.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111211002221 its reverse (122200112111), we get a palindrome (233411114332).

The spelling of 111211002221 in words is "one hundred eleven billion, two hundred eleven million, two thousand, two hundred twenty-one".