11221210111212 has 72 divisors (see below), whose sum is σ = 28582517723760. Its totient is φ = 3711686060160.

The previous prime is 11221210111141. The next prime is 11221210111249. The reversal of 11221210111212 is 21211101212211.

It is a happy number.

11221210111212 is a `hidden beast` number, since 11 + 221 + 210 + 1 + 11 + 212 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153955114 + ... + 154027982.

It is an arithmetic number, because the mean of its divisors is an integer number (396979412830).

Almost surely, 2^{11221210111212} is an apocalyptic number.

11221210111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11221210111212 is an abundant number, since it is smaller than the sum of its proper divisors (17361307612548).

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

11221210111212 is a wasteful number, since it uses less digits than its factorization.

11221210111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105663 (or 105658 counting only the distinct ones).

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

Adding to 11221210111212 its reverse (21211101212211), we get a palindrome (32432311323423).

The spelling of 11221210111212 in words is "eleven trillion, two hundred twenty-one billion, two hundred ten million, one hundred eleven thousand, two hundred twelve".