221422215 has 32 divisors (see below), whose sum is σ = 406264320. Its totient is φ = 100877184.

The previous prime is 221422211. The next prime is 221422237. The reversal of 221422215 is 512224122.

It is not a de Polignac number, because 221422215 - 2² = 221422211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 221422191 and 221422200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221422211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28801 + ... + 35669.

It is an arithmetic number, because the mean of its divisors is an integer number (12695760).

Almost surely, 2^221422215 is an apocalyptic number.

221422215 is a deficient number, since it is larger than the sum of its proper divisors (184842105).

221422215 is a wasteful number, since it uses less digits than its factorization.

221422215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7191.

The product of its digits is 640, while the sum is 21.

The square root of 221422215 is about 14880.2625984893. The cubic root of 221422215 is about 604.9791354961.

Adding to 221422215 its reverse (512224122), we get a palindrome (733646337).

The spelling of 221422215 in words is "two hundred twenty-one million, four hundred twenty-two thousand, two hundred fifteen".