21416535671 has 2 divisors, whose sum is σ = 21416535672. Its totient is φ = 21416535670.

The previous prime is 21416535649. The next prime is 21416535683. The reversal of 21416535671 is 17653561412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21416535671 - 2¹⁴ = 21416519287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21416535631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10708267835 + 10708267836.

It is an arithmetic number, because the mean of its divisors is an integer number (10708267836).

Almost surely, 2^21416535671 is an apocalyptic number.

21416535671 is a deficient number, since it is larger than the sum of its proper divisors (1).

21416535671 is an equidigital number, since it uses as much as digits as its factorization.

21416535671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 41.

The spelling of 21416535671 in words is "twenty-one billion, four hundred sixteen million, five hundred thirty-five thousand, six hundred seventy-one".