21455000532271 has 2 divisors, whose sum is σ = 21455000532272. Its totient is φ = 21455000532270.

The previous prime is 21455000532083. The next prime is 21455000532281. The reversal of 21455000532271 is 17223500055412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21455000532271 - 2¹⁷ = 21455000401199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21455000532271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21455000532281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727500266135 + 10727500266136.

It is an arithmetic number, because the mean of its divisors is an integer number (10727500266136).

Almost surely, 2^{21455000532271} is an apocalyptic number.

21455000532271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21455000532271 is an equidigital number, since it uses as much as digits as its factorization.

21455000532271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84000, while the sum is 37.

Adding to 21455000532271 its reverse (17223500055412), we get a palindrome (38678500587683).

The spelling of 21455000532271 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred thirty-two thousand, two hundred seventy-one".