11011111001212 has 144 divisors (see below), whose sum is σ = 23742330796800. Its totient is φ = 4375784724480.

The previous prime is 11011111001173. The next prime is 11011111001213. The reversal of 11011111001212 is 21210011111011.

It is a junction number, because it is equal to n+sod(n) for n = 11011111001192 and 11011111001201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011111001213) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 147309864 + ... + 147384592.

It is an arithmetic number, because the mean of its divisors is an integer number (164877297200).

Almost surely, 2^{11011111001212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11011111001212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11871165398400).

11011111001212 is an abundant number, since it is smaller than the sum of its proper divisors (12731219795588).

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

11011111001212 is a wasteful number, since it uses less digits than its factorization.

11011111001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75044 (or 75025 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 11011111001212 its reverse (21210011111011), we get a palindrome (32221122112223).

The spelling of 11011111001212 in words is "eleven trillion, eleven billion, one hundred eleven million, one thousand, two hundred twelve".