111212220213 has 10 divisors (see below), whose sum is σ = 166131835254. Its totient is φ = 74141480088.

The previous prime is 111212220199. The next prime is 111212220277. The reversal of 111212220213 is 312022212111.

It can be written as a sum of positive squares in only one way, i.e., 69167948004 + 42044272209 = 262998^2 + 205047^2 .

It is not a de Polignac number, because 111212220213 - 2¹⁰ = 111212219189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212220283) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 686495106 + ... + 686495267.

Almost surely, 2^111212220213 is an apocalyptic number.

It is an amenable number.

111212220213 is a deficient number, since it is larger than the sum of its proper divisors (54919615041).

111212220213 is an equidigital number, since it uses as much as digits as its factorization.

111212220213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372990385 (or 1372990376 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 111212220213 its reverse (312022212111), we get a palindrome (423234432324).

The spelling of 111212220213 in words is "one hundred eleven billion, two hundred twelve million, two hundred twenty thousand, two hundred thirteen".