21530501005033 has 2 divisors, whose sum is σ = 21530501005034. Its totient is φ = 21530501005032.

The previous prime is 21530501004967. The next prime is 21530501005049. The reversal of 21530501005033 is 33050010503512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14686040424169 + 6844460580864 = 3832237^2 + 2616192^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21530501005033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21530501004992 and 21530501005010.

It is not a weakly prime, because it can be changed into another prime (21530501005133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10765250502516 + 10765250502517.

It is an arithmetic number, because the mean of its divisors is an integer number (10765250502517).

Almost surely, 2^{21530501005033} is an apocalyptic number.

It is an amenable number.

21530501005033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21530501005033 is an equidigital number, since it uses as much as digits as its factorization.

21530501005033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6750, while the sum is 28.

Adding to 21530501005033 its reverse (33050010503512), we get a palindrome (54580511508545).

The spelling of 21530501005033 in words is "twenty-one trillion, five hundred thirty billion, five hundred one million, five thousand, thirty-three".