305222021 has 16 divisors (see below), whose sum is σ = 333312000. Its totient is φ = 277820928.

The previous prime is 305222003. The next prime is 305222039. The reversal of 305222021 is 120222503.

It is an interprime number because it is at equal distance from previous prime (305222003) and next prime (305222039).

It is a cyclic number.

It is not a de Polignac number, because 305222021 - 2⁶ = 305221957 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 (305222521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328085 + ... + 329013.

It is an arithmetic number, because the mean of its divisors is an integer number (20832000).

Almost surely, 2^305222021 is an apocalyptic number.

It is an amenable number.

305222021 is a deficient number, since it is larger than the sum of its proper divisors (28089979).

305222021 is a wasteful number, since it uses less digits than its factorization.

305222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 305222021 is about 17470.6044829594. The cubic root of 305222021 is about 673.2948427224.

Adding to 305222021 its reverse (120222503), we get a palindrome (425444524).

The spelling of 305222021 in words is "three hundred five million, two hundred twenty-two thousand, twenty-one".