111210220121221 has 4 divisors (see below), whose sum is σ = 119764852438252. Its totient is φ = 102655587804192.

The previous prime is 111210220121207. The next prime is 111210220121249. The reversal of 111210220121221 is 122121022012111.

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 42229072592100 + 68981147529121 = 6498390^2 + 8305489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111210220121221 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 (111210220127221) 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, 4277316158496 + ... + 4277316158521.

It is an arithmetic number, because the mean of its divisors is an integer number (29941213109563).

Almost surely, 2^{111210220121221} is an apocalyptic number.

It is an amenable number.

111210220121221 is a deficient number, since it is larger than the sum of its proper divisors (8554632317031).

111210220121221 is an equidigital number, since it uses as much as digits as its factorization.

111210220121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8554632317030.

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

Adding to 111210220121221 its reverse (122121022012111), we get a palindrome (233331242133332).

The spelling of 111210220121221 in words is "one hundred eleven trillion, two hundred ten billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".