11211111112212 has 72 divisors (see below), whose sum is σ = 30916181997792. Its totient is φ = 3397230158400.

The previous prime is 11211111112207. The next prime is 11211111112217. The reversal of 11211111112212 is 21221111111211.

It is an interprime number because it is at equal distance from previous prime (11211111112207) and next prime (11211111112217).

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

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 (11211111112217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18801963 + ... + 19389069.

It is an arithmetic number, because the mean of its divisors is an integer number (429391416636).

Almost surely, 2^{11211111112212} is an apocalyptic number.

11211111112212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11211111112212 is an abundant number, since it is smaller than the sum of its proper divisors (19705070885580).

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

11211111112212 is a wasteful number, since it uses less digits than its factorization.

11211111112212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635349 (or 635344 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 11211111112212 its reverse (21221111111211), we get a palindrome (32432222223423).

The spelling of 11211111112212 in words is "eleven trillion, two hundred eleven billion, one hundred eleven million, one hundred twelve thousand, two hundred twelve".