216420671 has 2 divisors, whose sum is σ = 216420672. Its totient is φ = 216420670.

The previous prime is 216420667. The next prime is 216420683. The reversal of 216420671 is 176024612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216420671 - 2² = 216420667 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216420371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108210335 + 108210336.

It is an arithmetic number, because the mean of its divisors is an integer number (108210336).

Almost surely, 2^216420671 is an apocalyptic number.

216420671 is a deficient number, since it is larger than the sum of its proper divisors (1).

216420671 is an equidigital number, since it uses as much as digits as its factorization.

216420671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 216420671 is about 14711.2430134234. The cubic root of 216420671 is about 600.3892575948.

The spelling of 216420671 in words is "two hundred sixteen million, four hundred twenty thousand, six hundred seventy-one".