303000021 has 20 divisors (see below), whose sum is σ = 453954732. Its totient is φ = 201408768.

The previous prime is 303000007. The next prime is 303000041. The reversal of 303000021 is 120000303.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 53802225 + 249197796 = 7335^2 + 15786^2 .

It is not a de Polignac number, because 303000021 - 2⁵ = 302999989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 302999967 and 303000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (303000001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23295 + ... + 33891.

Almost surely, 2^303000021 is an apocalyptic number.

It is an amenable number.

303000021 is a deficient number, since it is larger than the sum of its proper divisors (150954711).

303000021 is a wasteful number, since it uses less digits than its factorization.

303000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10962 (or 10953 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

The square root of 303000021 is about 17406.8957887384. The cubic root of 303000021 is about 671.6570116716.

Adding to 303000021 its reverse (120000303), we get a palindrome (423000324).

The spelling of 303000021 in words is "three hundred three million, twenty-one", and thus it is an aban number.