11640820212 has 144 divisors (see below), whose sum is σ = 35655692800. Its totient is φ = 3128051520.

The previous prime is 11640820189. The next prime is 11640820241. The reversal of 11640820212 is 21202804611.

11640820212 is a `hidden beast` number, since 1 + 1 + 640 + 8 + 2 + 0 + 2 + 12 = 666.

It is a congruent number.

It is an unprimeable number.

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, 656787 + ... + 674277.

Almost surely, 2^11640820212 is an apocalyptic number.

11640820212 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 11640820212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17827846400).

11640820212 is an abundant number, since it is smaller than the sum of its proper divisors (24014872588).

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

11640820212 is a wasteful number, since it uses less digits than its factorization.

11640820212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17666 (or 17661 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The spelling of 11640820212 in words is "eleven billion, six hundred forty million, eight hundred twenty thousand, two hundred twelve".