21540130372936 has 64 divisors (see below), whose sum is σ = 47666044846080. Its totient is φ = 8930005842240.

The previous prime is 21540130372931. The next prime is 21540130372949. The reversal of 21540130372936 is 63927303104512.

It is not an unprimeable number, because it can be changed into a prime (21540130372931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1645885 + ... + 6766771.

It is an arithmetic number, because the mean of its divisors is an integer number (744781950720).

Almost surely, 2^{21540130372936} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21540130372936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23833022423040).

21540130372936 is an abundant number, since it is smaller than the sum of its proper divisors (26125914473144).

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

21540130372936 is a wasteful number, since it uses less digits than its factorization.

21540130372936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5123354 (or 5123350 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 46.

The spelling of 21540130372936 in words is "twenty-one trillion, five hundred forty billion, one hundred thirty million, three hundred seventy-two thousand, nine hundred thirty-six".