21530541134315 has 4 divisors (see below), whose sum is σ = 25836649361184. Its totient is φ = 17224432907448.

The previous prime is 21530541134293. The next prime is 21530541134321. The reversal of 21530541134315 is 51343114503512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21530541134315 - 2²⁰ = 21530540085739 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2153054113427 + ... + 2153054113436.

It is an arithmetic number, because the mean of its divisors is an integer number (6459162340296).

Almost surely, 2^{21530541134315} is an apocalyptic number.

21530541134315 is a deficient number, since it is larger than the sum of its proper divisors (4306108226869).

21530541134315 is an equidigital number, since it uses as much as digits as its factorization.

21530541134315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306108226868.

The product of its (nonzero) digits is 108000, while the sum is 38.

Adding to 21530541134315 its reverse (51343114503512), we get a palindrome (72873655637827).

The spelling of 21530541134315 in words is "twenty-one trillion, five hundred thirty billion, five hundred forty-one million, one hundred thirty-four thousand, three hundred fifteen".