216522443 has 2 divisors, whose sum is σ = 216522444. Its totient is φ = 216522442.

The previous prime is 216522419. The next prime is 216522463. The reversal of 216522443 is 344225612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216522443 - 2⁶ = 216522379 is a prime.

It is equal to p_11941643 and since 216522443 and 11941643 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (216522403) 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, 108261221 + 108261222.

It is an arithmetic number, because the mean of its divisors is an integer number (108261222).

Almost surely, 2^216522443 is an apocalyptic number.

216522443 is a deficient number, since it is larger than the sum of its proper divisors (1).

216522443 is an equidigital number, since it uses as much as digits as its factorization.

216522443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 29.

The square root of 216522443 is about 14714.7015939842. The cubic root of 216522443 is about 600.4833540288.

The spelling of 216522443 in words is "two hundred sixteen million, five hundred twenty-two thousand, four hundred forty-three".