21532504315040 has 96 divisors (see below), whose sum is σ = 51676988186880. Its totient is φ = 8477148386304.

The previous prime is 21532504315039. The next prime is 21532504315043. The reversal of 21532504315040 is 4051340523512.

It is not an unprimeable number, because it can be changed into a prime (21532504315043) 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, 1319939 + ... + 6693821.

It is an arithmetic number, because the mean of its divisors is an integer number (538301960280).

Almost surely, 2^{21532504315040} is an apocalyptic number.

21532504315040 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 21532504315040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25838494093440).

21532504315040 is an abundant number, since it is smaller than the sum of its proper divisors (30144483871840).

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

21532504315040 is a wasteful number, since it uses less digits than its factorization.

21532504315040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5374294 (or 5374286 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 21532504315040 its reverse (4051340523512), we get a palindrome (25583844838552).

The spelling of 21532504315040 in words is "twenty-one trillion, five hundred thirty-two billion, five hundred four million, three hundred fifteen thousand, forty".