11810921440 has 24 divisors (see below), whose sum is σ = 27903302280. Its totient is φ = 4724368512.

The previous prime is 11810921389. The next prime is 11810921459. The reversal of 11810921440 is 4412901811.

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, 36908970 + ... + 36909289.

It is an arithmetic number, because the mean of its divisors is an integer number (1162637595).

Almost surely, 2^11810921440 is an apocalyptic number.

11810921440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11810921440 is an abundant number, since it is smaller than the sum of its proper divisors (16092380840).

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

11810921440 is an equidigital number, since it uses as much as digits as its factorization.

11810921440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73818274 (or 73818266 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 11810921440 in words is "eleven billion, eight hundred ten million, nine hundred twenty-one thousand, four hundred forty".