11212021212 has 144 divisors (see below), whose sum is σ = 30863809536. Its totient is φ = 3103142400.

The previous prime is 11212021207. The next prime is 11212021213. The reversal of 11212021212 is 21212021211.

It is a junction number, because it is equal to n+sod(n) for n = 11212021191 and 11212021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212021213) 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 47 ways as a sum of consecutive naturals, for example, 38266138 + ... + 38266430.

Almost surely, 2^11212021212 is an apocalyptic number.

11212021212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11212021212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15431904768).

11212021212 is an abundant number, since it is smaller than the sum of its proper divisors (19651788324).

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

11212021212 is a wasteful number, since it uses less digits than its factorization.

11212021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11212021212 its reverse (21212021211), we get a palindrome (32424042423).

Subtracting 11212021212 from its reverse (21212021211), we obtain a palindrome (9999999999).

The spelling of 11212021212 in words is "eleven billion, two hundred twelve million, twenty-one thousand, two hundred twelve".