11821128943440 has 40 divisors (see below), whose sum is σ = 36645499725408. Its totient is φ = 3152301051520.

The previous prime is 11821128943409. The next prime is 11821128943543. The reversal of 11821128943440 is 4434982112811.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 11821128943440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24627351726 + ... + 24627352205.

Almost surely, 2^{11821128943440} is an apocalyptic number.

11821128943440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11821128943440 is an abundant number, since it is smaller than the sum of its proper divisors (24824370781968).

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

11821128943440 is a wasteful number, since it uses less digits than its factorization.

11821128943440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49254703947 (or 49254703941 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 48.

The spelling of 11821128943440 in words is "eleven trillion, eight hundred twenty-one billion, one hundred twenty-eight million, nine hundred forty-three thousand, four hundred forty".