111010013211221 has 4 divisors (see below), whose sum is σ = 111048174098700. Its totient is φ = 110971852323744.

The previous prime is 111010013211199. The next prime is 111010013211283. The reversal of 111010013211221 is 122112310010111.

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 80474552919121 + 30535460292100 = 8970761^2 + 5525890^2 .

It is a cyclic number.

It is not a de Polignac number, because 111010013211221 - 2⁶ = 111010013211157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111010013211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111010012211221) 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, 19080439376 + ... + 19080445193.

It is an arithmetic number, because the mean of its divisors is an integer number (27762043524675).

Almost surely, 2^{111010013211221} is an apocalyptic number.

It is an amenable number.

111010013211221 is a deficient number, since it is larger than the sum of its proper divisors (38160887479).

111010013211221 is an equidigital number, since it uses as much as digits as its factorization.

111010013211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38160887478.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 111010013211221 its reverse (122112310010111), we get a palindrome (233122323221332).

The spelling of 111010013211221 in words is "one hundred eleven trillion, ten billion, thirteen million, two hundred eleven thousand, two hundred twenty-one".