30021812 has 6 divisors (see below), whose sum is σ = 52538178. Its totient is φ = 15010904.

The previous prime is 30021809. The next prime is 30021833. The reversal of 30021812 is 21812003.

It can be written as a sum of positive squares in only one way, i.e., 17673616 + 12348196 = 4204^2 + 3514^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3752723 + ... + 3752730.

It is an arithmetic number, because the mean of its divisors is an integer number (8756363).

Almost surely, 2^30021812 is an apocalyptic number.

It is an amenable number.

30021812 is a deficient number, since it is larger than the sum of its proper divisors (22516366).

30021812 is a wasteful number, since it uses less digits than its factorization.

30021812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7505457 (or 7505455 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 30021812 is about 5479.2163673285. The cubic root of 30021812 is about 310.7985378581.

Adding to 30021812 its reverse (21812003), we get a palindrome (51833815).

The spelling of 30021812 in words is "thirty million, twenty-one thousand, eight hundred twelve".