30021361 has 4 divisors (see below), whose sum is σ = 30989824. Its totient is φ = 29052900.

The previous prime is 30021347. The next prime is 30021377. The reversal of 30021361 is 16312003.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30021361 - 2¹¹ = 30019313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30021461) 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 3 ways as a sum of consecutive naturals, for example, 484185 + ... + 484246.

It is an arithmetic number, because the mean of its divisors is an integer number (7747456).

Almost surely, 2^30021361 is an apocalyptic number.

30021361 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

30021361 is a deficient number, since it is larger than the sum of its proper divisors (968463).

30021361 is an equidigital number, since it uses as much as digits as its factorization.

30021361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968462.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 30021361 is about 5479.1752116537. The cubic root of 30021361 is about 310.7969815358.

Adding to 30021361 its reverse (16312003), we get a palindrome (46333364).

The spelling of 30021361 in words is "thirty million, twenty-one thousand, three hundred sixty-one".