10111212218 has 4 divisors (see below), whose sum is σ = 15166818330. Its totient is φ = 5055606108.

The previous prime is 10111212211. The next prime is 10111212269. The reversal of 10111212218 is 81221211101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7688308489 + 2422903729 = 87683^2 + 49223^2 .

It is a super-2 number, since 2×10111212218² (a number of 21 digits) contains 22 as substring.

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 10111212218.

It is not an unprimeable number, because it can be changed into a prime (10111212211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2527803053 + ... + 2527803056.

Almost surely, 2^10111212218 is an apocalyptic number.

10111212218 is a deficient number, since it is larger than the sum of its proper divisors (5055606112).

10111212218 is an equidigital number, since it uses as much as digits as its factorization.

10111212218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5055606111.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 10111212218 its reverse (81221211101), we get a palindrome (91332423319).

The spelling of 10111212218 in words is "ten billion, one hundred eleven million, two hundred twelve thousand, two hundred eighteen".