21530541134189 has 2 divisors, whose sum is σ = 21530541134190. Its totient is φ = 21530541134188.

The previous prime is 21530541134149. The next prime is 21530541134243. The reversal of 21530541134189 is 98143114503512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21406658253289 + 123882880900 = 4626733^2 + 351970^2 .

It is a cyclic number.

It is not a de Polignac number, because 21530541134189 - 2¹² = 21530541130093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21530541134149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10765270567094 + 10765270567095.

It is an arithmetic number, because the mean of its divisors is an integer number (10765270567095).

Almost surely, 2^{21530541134189} is an apocalyptic number.

It is an amenable number.

21530541134189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21530541134189 is an equidigital number, since it uses as much as digits as its factorization.

21530541134189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 21530541134189 in words is "twenty-one trillion, five hundred thirty billion, five hundred forty-one million, one hundred thirty-four thousand, one hundred eighty-nine".