21530540335040 has 56 divisors (see below), whose sum is σ = 55930471834032. Its totient is φ = 7829287393280.

The previous prime is 21530540335039. The next prime is 21530540335061. The reversal of 21530540335040 is 4053304503512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3058311869 + ... + 3058318908.

Almost surely, 2^{21530540335040} is an apocalyptic number.

21530540335040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21530540335040 is an abundant number, since it is smaller than the sum of its proper divisors (34399931498992).

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

21530540335040 is a wasteful number, since it uses less digits than its factorization.

21530540335040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6116630805 (or 6116630795 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 35.

Adding to 21530540335040 its reverse (4053304503512), we get a palindrome (25583844838552).

The spelling of 21530540335040 in words is "twenty-one trillion, five hundred thirty billion, five hundred forty million, three hundred thirty-five thousand, forty".