30236021 has 2 divisors, whose sum is σ = 30236022. Its totient is φ = 30236020.

The previous prime is 30235999. The next prime is 30236027. The reversal of 30236021 is 12063203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27447121 + 2788900 = 5239^2 + 1670^2 .

It is an emirp because it is prime and its reverse (12063203) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30236021 - 2¹⁸ = 29973877 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30236027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15118010 + 15118011.

It is an arithmetic number, because the mean of its divisors is an integer number (15118011).

Almost surely, 2^30236021 is an apocalyptic number.

It is an amenable number.

30236021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30236021 is an equidigital number, since it uses as much as digits as its factorization.

30236021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 30236021 is about 5498.7290349680. The cubic root of 30236021 is about 311.5359808728.

Adding to 30236021 its reverse (12063203), we get a palindrome (42299224).

The spelling of 30236021 in words is "thirty million, two hundred thirty-six thousand, twenty-one".