111122221001221 has 4 divisors (see below), whose sum is σ = 111868007719500. Its totient is φ = 110376434282944.

The previous prime is 111122221001203. The next prime is 111122221001251. The reversal of 111122221001221 is 122100122221111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44121677032225 + 67000543968996 = 6642415^2 + 8185386^2 .

It is a cyclic number.

It is not a de Polignac number, because 111122221001221 - 2⁹ = 111122221000709 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 (111122221001201) 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, 372893358916 + ... + 372893359213.

It is an arithmetic number, because the mean of its divisors is an integer number (27967001929875).

Almost surely, 2^{111122221001221} is an apocalyptic number.

It is an amenable number.

111122221001221 is a deficient number, since it is larger than the sum of its proper divisors (745786718279).

111122221001221 is an equidigital number, since it uses as much as digits as its factorization.

111122221001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745786718278.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111122221001221 its reverse (122100122221111), we get a palindrome (233222343222332).

The spelling of 111122221001221 in words is "one hundred eleven trillion, one hundred twenty-two billion, two hundred twenty-one million, one thousand, two hundred twenty-one".