111220213213 has 4 divisors (see below), whose sum is σ = 112469878620. Its totient is φ = 109970547808.

The previous prime is 111220213087. The next prime is 111220213231. The reversal of 111220213213 is 312312022111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312312022111 = 15121 ⋅20654191.

It can be written as a sum of positive squares in 2 ways, for example, as 15329658969 + 95890554244 = 123813^2 + 309662^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111220213213 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 (111220213253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624832570 + ... + 624832747.

It is an arithmetic number, because the mean of its divisors is an integer number (28117469655).

Almost surely, 2^111220213213 is an apocalyptic number.

It is an amenable number.

111220213213 is a deficient number, since it is larger than the sum of its proper divisors (1249665407).

111220213213 is an equidigital number, since it uses as much as digits as its factorization.

111220213213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249665406.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 111220213213 its reverse (312312022111), we get a palindrome (423532235324).

The spelling of 111220213213 in words is "one hundred eleven billion, two hundred twenty million, two hundred thirteen thousand, two hundred thirteen".