21530550130151 has 2 divisors, whose sum is σ = 21530550130152. Its totient is φ = 21530550130150.

The previous prime is 21530550130109. The next prime is 21530550130181. The reversal of 21530550130151 is 15103105503512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21530550130151 - 2²⁶ = 21530483021287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21530550130181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10765275065075 + 10765275065076.

It is an arithmetic number, because the mean of its divisors is an integer number (10765275065076).

Almost surely, 2^{21530550130151} is an apocalyptic number.

21530550130151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21530550130151 is an equidigital number, since it uses as much as digits as its factorization.

21530550130151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11250, while the sum is 32.

Adding to 21530550130151 its reverse (15103105503512), we get a palindrome (36633655633663).

The spelling of 21530550130151 in words is "twenty-one trillion, five hundred thirty billion, five hundred fifty million, one hundred thirty thousand, one hundred fifty-one".