216222041 has 4 divisors (see below), whose sum is σ = 247110912. Its totient is φ = 185333172.

The previous prime is 216222023. The next prime is 216222059. The reversal of 216222041 is 140222612.

It is a happy number.

216222041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (216222023) and next prime (216222059).

It is a cyclic number.

It is not a de Polignac number, because 216222041 - 2²⁶ = 149113177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216222001) 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, 15444425 + ... + 15444438.

It is an arithmetic number, because the mean of its divisors is an integer number (61777728).

Almost surely, 2^216222041 is an apocalyptic number.

It is an amenable number.

216222041 is a deficient number, since it is larger than the sum of its proper divisors (30888871).

216222041 is an equidigital number, since it uses as much as digits as its factorization.

216222041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30888870.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 216222041 is about 14704.4905046044. The cubic root of 216222041 is about 600.2055231109.

Adding to 216222041 its reverse (140222612), we get a palindrome (356444653).

The spelling of 216222041 in words is "two hundred sixteen million, two hundred twenty-two thousand, forty-one".