21541123235040 has 96 divisors (see below), whose sum is σ = 71425829704320. Its totient is φ = 5441967972864.

The previous prime is 21541123234957. The next prime is 21541123235069. The reversal of 21541123235040 is 4053232114512.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 21541123234992 and 21541123235010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1180973514 + ... + 1180991753.

It is an arithmetic number, because the mean of its divisors is an integer number (744019059420).

Almost surely, 2^{21541123235040} is an apocalyptic number.

21541123235040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21541123235040 is an abundant number, since it is smaller than the sum of its proper divisors (49884706469280).

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

21541123235040 is a wasteful number, since it uses less digits than its factorization.

21541123235040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361965304 (or 2361965296 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 21541123235040 its reverse (4053232114512), we get a palindrome (25594355349552).

The spelling of 21541123235040 in words is "twenty-one trillion, five hundred forty-one billion, one hundred twenty-three million, two hundred thirty-five thousand, forty".