21472731235871 has 2 divisors, whose sum is σ = 21472731235872. Its totient is φ = 21472731235870.

The previous prime is 21472731235831. The next prime is 21472731235933. The reversal of 21472731235871 is 17853213727412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21472731235871 - 2²⁶ = 21472664127007 is a prime.

It is a super-2 number, since 2×21472731235871² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21472731235801) 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, 10736365617935 + 10736365617936.

It is an arithmetic number, because the mean of its divisors is an integer number (10736365617936).

Almost surely, 2^{21472731235871} is an apocalyptic number.

21472731235871 is a deficient number, since it is larger than the sum of its proper divisors (1).

21472731235871 is an equidigital number, since it uses as much as digits as its factorization.

21472731235871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3951360, while the sum is 53.

The spelling of 21472731235871 in words is "twenty-one trillion, four hundred seventy-two billion, seven hundred thirty-one million, two hundred thirty-five thousand, eight hundred seventy-one".