11111212122 has 16 divisors (see below), whose sum is σ = 23392025760. Its totient is φ = 3508803792.

The previous prime is 11111212109. The next prime is 11111212153. The reversal of 11111212122 is 22121211111.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48733273 + ... + 48733500.

It is an arithmetic number, because the mean of its divisors is an integer number (1462001610).

Almost surely, 2^11111212122 is an apocalyptic number.

11111212122 is an abundant number, since it is smaller than the sum of its proper divisors (12280813638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11111212122 is a wasteful number, since it uses less digits than its factorization.

11111212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97466797.

The product of its digits is 16, while the sum is 15.

Adding to 11111212122 its reverse (22121211111), we get a palindrome (33232423233).

The spelling of 11111212122 in words is "eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-two".