11851221788 has 12 divisors (see below), whose sum is σ = 23702443632. Its totient is φ = 5079095040.

The previous prime is 11851221763. The next prime is 11851221791. The reversal of 11851221788 is 88712215811.

11851221788 is an admirable number.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211628933 + ... + 211628988.

It is an arithmetic number, because the mean of its divisors is an integer number (1975203636).

Almost surely, 2^11851221788 is an apocalyptic number.

It is an amenable number.

11851221788 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

11851221788 is a wasteful number, since it uses less digits than its factorization.

11851221788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423257932 (or 423257930 counting only the distinct ones).

The product of its digits is 71680, while the sum is 44.

The spelling of 11851221788 in words is "eleven billion, eight hundred fifty-one million, two hundred twenty-one thousand, seven hundred eighty-eight".