111211212122 has 4 divisors (see below), whose sum is σ = 166816818186. Its totient is φ = 55605606060.

The previous prime is 111211212103. The next prime is 111211212191. The reversal of 111211212122 is 221212112111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221212112111 = 17 ⋅13012477183.

It can be written as a sum of positive squares in only one way, i.e., 90324892681 + 20886319441 = 300541^2 + 144521^2 .

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 111211212122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27802803029 + ... + 27802803032.

Almost surely, 2^111211212122 is an apocalyptic number.

111211212122 is a deficient number, since it is larger than the sum of its proper divisors (55605606064).

111211212122 is an equidigital number, since it uses as much as digits as its factorization.

111211212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55605606063.

The product of its digits is 32, while the sum is 17.

Adding to 111211212122 its reverse (221212112111), we get a palindrome (332423324233).

The spelling of 111211212122 in words is "one hundred eleven billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-two".