30113821 has 2 divisors, whose sum is σ = 30113822. Its totient is φ = 30113820.

The previous prime is 30113813. The next prime is 30113827. The reversal of 30113821 is 12831103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19316025 + 10797796 = 4395^2 + 3286^2 .

It is a cyclic number.

It is not a de Polignac number, because 30113821 - 2³ = 30113813 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 (30113827) by changing a digit.

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, 15056910 + 15056911.

It is an arithmetic number, because the mean of its divisors is an integer number (15056911).

Almost surely, 2^30113821 is an apocalyptic number.

It is an amenable number.

30113821 is a deficient number, since it is larger than the sum of its proper divisors (1).

30113821 is an equidigital number, since it uses as much as digits as its factorization.

30113821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 30113821 is about 5487.6061265364. The cubic root of 30113821 is about 311.1157194565.

Adding to 30113821 its reverse (12831103), we get a palindrome (42944924).

The spelling of 30113821 in words is "thirty million, one hundred thirteen thousand, eight hundred twenty-one".