302220421 has 4 divisors (see below), whose sum is σ = 304895052. Its totient is φ = 299545792.

The previous prime is 302220379. The next prime is 302220433. The reversal of 302220421 is 124022203.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124022203 = 283 ⋅438241.

It can be written as a sum of positive squares in 2 ways, for example, as 81252196 + 220968225 = 9014^2 + 14865^2 .

It is a cyclic number.

It is not a de Polignac number, because 302220421 - 2¹⁹ = 301696133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 302220395 and 302220404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (302220491) 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, 1337146 + ... + 1337371.

It is an arithmetic number, because the mean of its divisors is an integer number (76223763).

Almost surely, 2^302220421 is an apocalyptic number.

It is an amenable number.

302220421 is a deficient number, since it is larger than the sum of its proper divisors (2674631).

302220421 is a wasteful number, since it uses less digits than its factorization.

302220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2674630.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 302220421 is about 17384.4879418406. The cubic root of 302220421 is about 671.0804731714.

Adding to 302220421 its reverse (124022203), we get a palindrome (426242624).

The spelling of 302220421 in words is "three hundred two million, two hundred twenty thousand, four hundred twenty-one".