11212121312 has 48 divisors (see below), whose sum is σ = 26555034240. Its totient is φ = 4552288128.

The previous prime is 11212121311. The next prime is 11212121321. The reversal of 11212121312 is 21312121211.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212121311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1312958 + ... + 1321469.

It is an arithmetic number, because the mean of its divisors is an integer number (553229880).

Almost surely, 2^11212121312 is an apocalyptic number.

It is an amenable number.

11212121312 is an abundant number, since it is smaller than the sum of its proper divisors (15342912928).

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

11212121312 is a wasteful number, since it uses less digits than its factorization.

11212121312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634463 (or 2634455 counting only the distinct ones).

The product of its digits is 48, while the sum is 17.

Adding to 11212121312 its reverse (21312121211), we get a palindrome (32524242523).

The spelling of 11212121312 in words is "eleven billion, two hundred twelve million, one hundred twenty-one thousand, three hundred twelve".