111012221221 has 4 divisors (see below), whose sum is σ = 121104241344. Its totient is φ = 100920201100.

The previous prime is 111012221171. The next prime is 111012221261. The reversal of 111012221221 is 122122210111.

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 an emirpimes, since its reverse is a distinct semiprime: 122122210111 = 11 ⋅11102019101.

It is a cyclic number.

It is not a de Polignac number, because 111012221221 - 2¹¹ = 111012219173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111012221195 and 111012221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111012221261) 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, 5046010045 + ... + 5046010066.

It is an arithmetic number, because the mean of its divisors is an integer number (30276060336).

Almost surely, 2^111012221221 is an apocalyptic number.

111012221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111012221221 is a deficient number, since it is larger than the sum of its proper divisors (10092020123).

111012221221 is a wasteful number, since it uses less digits than its factorization.

111012221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10092020122.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111012221221 its reverse (122122210111), we get a palindrome (233134431332).

It can be divided in two parts, 111012 and 221221, that added together give a palindrome (332233).

The spelling of 111012221221 in words is "one hundred eleven billion, twelve million, two hundred twenty-one thousand, two hundred twenty-one".