11111121212 has 12 divisors (see below), whose sum is σ = 19449318840. Its totient is φ = 5554172976.

The previous prime is 11111121211. The next prime is 11111121247. The reversal of 11111121212 is 21212111111.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111121211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328787 + ... + 361002.

It is an arithmetic number, because the mean of its divisors is an integer number (1620776570).

Almost surely, 2^11111121212 is an apocalyptic number.

It is an amenable number.

11111121212 is a deficient number, since it is larger than the sum of its proper divisors (8338197628).

11111121212 is a wasteful number, since it uses less digits than its factorization.

11111121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693820 (or 693818 counting only the distinct ones).

The product of its digits is 8, while the sum is 14.

Adding to 11111121212 its reverse (21212111111), we get a palindrome (32323232323).

It can be divided in two parts, 111111 and 21212, that multiplied together give a palindrome (2356886532).

The spelling of 11111121212 in words is "eleven billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twelve".