30440021 has 2 divisors, whose sum is σ = 30440022. Its totient is φ = 30440020.

The previous prime is 30440009. The next prime is 30440029. The reversal of 30440021 is 12004403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27447121 + 2992900 = 5239^2 + 1730^2 .

It is an emirp because it is prime and its reverse (12004403) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30440021 - 2¹⁰ = 30438997 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 30439978 and 30440005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30440029) 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 as a sum of consecutive naturals, namely, 15220010 + 15220011.

It is an arithmetic number, because the mean of its divisors is an integer number (15220011).

Almost surely, 2^30440021 is an apocalyptic number.

It is an amenable number.

30440021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30440021 is an equidigital number, since it uses as much as digits as its factorization.

30440021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 30440021 is about 5517.2475927767. The cubic root of 30440021 is about 312.2350471034.

Adding to 30440021 its reverse (12004403), we get a palindrome (42444424).

The spelling of 30440021 in words is "thirty million, four hundred forty thousand, twenty-one".