11212121221110 has 64 divisors (see below), whose sum is σ = 29915760130560. Its totient is φ = 2988221971680.

The previous prime is 11212121221019. The next prime is 11212121221139. The reversal of 11212121221110 is 1112212121211.

It is a happy number.

11212121221110 is a `hidden beast` number, since 1 + 1 + 212 + 121 + 221 + 110 = 666.

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 31 ways as a sum of consecutive naturals, for example, 11163676 + ... + 12126495.

It is an arithmetic number, because the mean of its divisors is an integer number (467433752040).

Almost surely, 2^{11212121221110} is an apocalyptic number.

11212121221110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11212121221110 is an abundant number, since it is smaller than the sum of its proper divisors (18703638909450).

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

11212121221110 is a wasteful number, since it uses less digits than its factorization.

11212121221110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23291970 (or 23291964 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11212121221110 its reverse (1112212121211), we get a palindrome (12324333342321).

The spelling of 11212121221110 in words is "eleven trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred ten".