216422447 has 4 divisors (see below), whose sum is σ = 223885320. Its totient is φ = 208959576.

The previous prime is 216422431. The next prime is 216422519. The reversal of 216422447 is 744224612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216422447 - 2⁴ = 216422431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216422047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3731393 + ... + 3731450.

It is an arithmetic number, because the mean of its divisors is an integer number (55971330).

Almost surely, 2^216422447 is an apocalyptic number.

216422447 is a deficient number, since it is larger than the sum of its proper divisors (7462873).

216422447 is an equidigital number, since it uses as much as digits as its factorization.

216422447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7462872.

The product of its digits is 21504, while the sum is 32.

The square root of 216422447 is about 14711.3033752962. The cubic root of 216422447 is about 600.3908999031.

The spelling of 216422447 in words is "two hundred sixteen million, four hundred twenty-two thousand, four hundred forty-seven".