21530241451133 has 4 divisors (see below), whose sum is σ = 21530882284800. Its totient is φ = 21529600617468.

The previous prime is 21530241451093. The next prime is 21530241451139. The reversal of 21530241451133 is 33115414203512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21530241451133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21530241451093 and 21530241451102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530241451139) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 320366435 + ... + 320433632.

It is an arithmetic number, because the mean of its divisors is an integer number (5382720571200).

Almost surely, 2^{21530241451133} is an apocalyptic number.

It is an amenable number.

21530241451133 is a deficient number, since it is larger than the sum of its proper divisors (640833667).

21530241451133 is an equidigital number, since it uses as much as digits as its factorization.

21530241451133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640833666.

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 21530241451133 its reverse (33115414203512), we get a palindrome (54645655654645).

The spelling of 21530241451133 in words is "twenty-one trillion, five hundred thirty billion, two hundred forty-one million, four hundred fifty-one thousand, one hundred thirty-three".