21606480271 has 2 divisors, whose sum is σ = 21606480272. Its totient is φ = 21606480270.

The previous prime is 21606480257. The next prime is 21606480283. The reversal of 21606480271 is 17208460612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21606480271 - 2¹⁷ = 21606349199 is a prime.

It is a super-2 number, since 2×21606480271² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21606480271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21606480221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10803240135 + 10803240136.

It is an arithmetic number, because the mean of its divisors is an integer number (10803240136).

Almost surely, 2^21606480271 is an apocalyptic number.

21606480271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21606480271 is an equidigital number, since it uses as much as digits as its factorization.

21606480271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 21606480271 in words is "twenty-one billion, six hundred six million, four hundred eighty thousand, two hundred seventy-one".