11111212134 has 192 divisors, whose sum is σ = 28151323200. Its totient is φ = 3135283200.

The previous prime is 11111212109. The next prime is 11111212153. The reversal of 11111212134 is 43121211111.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25660782 + ... + 25661214.

It is an arithmetic number, because the mean of its divisors is an integer number (146621475).

Almost surely, 2^11111212134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11111212134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14075661600).

11111212134 is an abundant number, since it is smaller than the sum of its proper divisors (17040111066).

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

11111212134 is a wasteful number, since it uses less digits than its factorization.

11111212134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631 (or 628 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 11111212134 its reverse (43121211111), we get a palindrome (54232423245).

The spelling of 11111212134 in words is "eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred thirty-four".