11312221212 has 60 divisors (see below), whose sum is σ = 29582565936. Its totient is φ = 3769441920.

The previous prime is 11312221187. The next prime is 11312221213. The reversal of 11312221212 is 21212221311.

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 (11312221213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1585012 + ... + 1592132.

Almost surely, 2^11312221212 is an apocalyptic number.

11312221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11312221212 is an abundant number, since it is smaller than the sum of its proper divisors (18270344724).

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

11312221212 is a wasteful number, since it uses less digits than its factorization.

11312221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12040 (or 12029 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 11312221212 its reverse (21212221311), we get a palindrome (32524442523).

Subtracting 11312221212 from its reverse (21212221311), we obtain a palindrome (9900000099).

The spelling of 11312221212 in words is "eleven billion, three hundred twelve million, two hundred twenty-one thousand, two hundred twelve".