11311312212 has 36 divisors (see below), whose sum is σ = 28647411156. Its totient is φ = 3763194240.

The previous prime is 11311312141. The next prime is 11311312213. The reversal of 11311312212 is 21221311311.

It can be written as a sum of positive squares in 2 ways, for example, as 2408257476 + 8903054736 = 49074^2 + 94356^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 (11311312213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 282783 + ... + 320294.

It is an arithmetic number, because the mean of its divisors is an integer number (795761421).

Almost surely, 2^11311312212 is an apocalyptic number.

11311312212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11311312212 is an abundant number, since it is smaller than the sum of its proper divisors (17336098944).

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

11311312212 is a wasteful number, since it uses less digits than its factorization.

11311312212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603608 (or 603603 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11311312212 its reverse (21221311311), we get a palindrome (32532623523).

Subtracting 11311312212 from its reverse (21221311311), we obtain a palindrome (9909999099).

The spelling of 11311312212 in words is "eleven billion, three hundred eleven million, three hundred twelve thousand, two hundred twelve".