111201011221 has 4 divisors (see below), whose sum is σ = 111201742944. Its totient is φ = 111200279500.

The previous prime is 111201011197. The next prime is 111201011227. The reversal of 111201011221 is 122110102111.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 111201011221 - 2⁷ = 111201011093 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 (111201011227) 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, 42835 + ... + 473536.

It is an arithmetic number, because the mean of its divisors is an integer number (27800435736).

Almost surely, 2^111201011221 is an apocalyptic number.

It is an amenable number.

111201011221 is a deficient number, since it is larger than the sum of its proper divisors (731723).

111201011221 is an equidigital number, since it uses as much as digits as its factorization.

111201011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731722.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111201011221 its reverse (122110102111), we get a palindrome (233311113332).

The spelling of 111201011221 in words is "one hundred eleven billion, two hundred one million, eleven thousand, two hundred twenty-one".