21118140380 has 48 divisors (see below), whose sum is σ = 44768747520. Its totient is φ = 8367508800.

The previous prime is 21118140377. The next prime is 21118140389. The reversal of 21118140380 is 8304181112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21118140389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 901415 + ... + 924545.

It is an arithmetic number, because the mean of its divisors is an integer number (932682240).

Almost surely, 2^21118140380 is an apocalyptic number.

21118140380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21118140380 is an abundant number, since it is smaller than the sum of its proper divisors (23650607140).

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

21118140380 is a wasteful number, since it uses less digits than its factorization.

21118140380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23570 (or 23568 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 29.

The spelling of 21118140380 in words is "twenty-one billion, one hundred eighteen million, one hundred forty thousand, three hundred eighty".