11112221121212 has 12 divisors (see below), whose sum is σ = 19775986741560. Its totient is φ = 5461939195056.

The previous prime is 11112221121121. The next prime is 11112221121217. The reversal of 11112221121212 is 21212112221111.

It is a happy number.

It is a super-3 number, since 3×11112221121212³ (a number of 40 digits) contains 333 as substring.

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 (11112221121217) 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, 23542841123 + ... + 23542841594.

It is an arithmetic number, because the mean of its divisors is an integer number (1647998895130).

Almost surely, 2^{11112221121212} is an apocalyptic number.

It is an amenable number.

11112221121212 is a deficient number, since it is larger than the sum of its proper divisors (8663765620348).

11112221121212 is a wasteful number, since it uses less digits than its factorization.

11112221121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47085682780 (or 47085682778 counting only the distinct ones).

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

Adding to 11112221121212 its reverse (21212112221111), we get a palindrome (32324333342323).

The spelling of 11112221121212 in words is "eleven trillion, one hundred twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twelve".