21500163600740 has 96 divisors (see below), whose sum is σ = 50952669401088. Its totient is φ = 7549837488000.

The previous prime is 21500163600739. The next prime is 21500163600743. The reversal of 21500163600740 is 4700636100512.

It is a self number, because there is not a number n which added to its sum of digits gives 21500163600740.

It is not an unprimeable number, because it can be changed into a prime (21500163600743) 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 31 ways as a sum of consecutive naturals, for example, 190346 + ... + 6560225.

It is an arithmetic number, because the mean of its divisors is an integer number (530756972928).

Almost surely, 2^{21500163600740} is an apocalyptic number.

21500163600740 is a gapful number since it is divisible by the number (20) 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 21500163600740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25476334700544).

21500163600740 is an abundant number, since it is smaller than the sum of its proper divisors (29452505800348).

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

21500163600740 is a wasteful number, since it uses less digits than its factorization.

21500163600740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6751089 (or 6751087 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 21500163600740 in words is "twenty-one trillion, five hundred billion, one hundred sixty-three million, six hundred thousand, seven hundred forty".