21530303045 has 8 divisors (see below), whose sum is σ = 25840181400. Its totient is φ = 17221697280.

The previous prime is 21530303027. The next prime is 21530303077. The reversal of 21530303045 is 54030303512.

It can be written as a sum of positive squares in 4 ways, for example, as 2954248609 + 18576054436 = 54353^2 + 136294^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21530303045 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280520 + ... + 348929.

It is an arithmetic number, because the mean of its divisors is an integer number (3230022675).

Almost surely, 2^21530303045 is an apocalyptic number.

It is an amenable number.

21530303045 is a deficient number, since it is larger than the sum of its proper divisors (4309878355).

21530303045 is an equidigital number, since it uses as much as digits as its factorization.

21530303045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636295.

The product of its (nonzero) digits is 5400, while the sum is 26.

Adding to 21530303045 its reverse (54030303512), we get a palindrome (75560606557).

The spelling of 21530303045 in words is "twenty-one billion, five hundred thirty million, three hundred three thousand, forty-five".