21530052662175 has 18 divisors (see below), whose sum is σ = 38562716546432. Its totient is φ = 11482694753040.

The previous prime is 21530052662159. The next prime is 21530052662243. The reversal of 21530052662175 is 57126625003512.

It is a happy number.

21530052662175 is a `hidden beast` number, since 2 + 1 + 5 + 30 + 0 + 526 + 6 + 21 + 75 = 666.

It is not a de Polignac number, because 21530052662175 - 2⁴ = 21530052662159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21530052662175.

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 17 ways as a sum of consecutive naturals, for example, 47844561247 + ... + 47844561696.

Almost surely, 2^{21530052662175} is an apocalyptic number.

21530052662175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21530052662175 is a deficient number, since it is larger than the sum of its proper divisors (17032663884257).

21530052662175 is a wasteful number, since it uses less digits than its factorization.

21530052662175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95689122959 (or 95689122951 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

Adding to 21530052662175 its reverse (57126625003512), we get a palindrome (78656677665687).

The spelling of 21530052662175 in words is "twenty-one trillion, five hundred thirty billion, fifty-two million, six hundred sixty-two thousand, one hundred seventy-five".