111213011213221 has 4 divisors (see below), whose sum is σ = 111213054648972. Its totient is φ = 111212967777472.

The previous prime is 111213011213201. The next prime is 111213011213243. The reversal of 111213011213221 is 122312110312111.

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 34515789500196 + 76697221713025 = 5875014^2 + 8757695^2 .

It is a cyclic number.

It is not a de Polignac number, because 111213011213221 - 2¹⁹ = 111213010688933 is a prime.

It is a super-2 number, since 2×111213011213221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111213011213192 and 111213011213201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111213011213201) 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, 17619466 + ... + 23084011.

It is an arithmetic number, because the mean of its divisors is an integer number (27803263662243).

Almost surely, 2^{111213011213221} is an apocalyptic number.

It is an amenable number.

111213011213221 is a deficient number, since it is larger than the sum of its proper divisors (43435751).

111213011213221 is an equidigital number, since it uses as much as digits as its factorization.

111213011213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43435750.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 111213011213221 its reverse (122312110312111), we get a palindrome (233525121525332).

The spelling of 111213011213221 in words is "one hundred eleven trillion, two hundred thirteen billion, eleven million, two hundred thirteen thousand, two hundred twenty-one".