30533821 has 2 divisors, whose sum is σ = 30533822. Its totient is φ = 30533820.

The previous prime is 30533813. The next prime is 30533837. The reversal of 30533821 is 12833503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28238596 + 2295225 = 5314^2 + 1515^2 .

It is a cyclic number.

It is not a de Polignac number, because 30533821 - 2³ = 30533813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30533851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15266910 + 15266911.

It is an arithmetic number, because the mean of its divisors is an integer number (15266911).

Almost surely, 2^30533821 is an apocalyptic number.

It is an amenable number.

30533821 is a deficient number, since it is larger than the sum of its proper divisors (1).

30533821 is an equidigital number, since it uses as much as digits as its factorization.

30533821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 30533821 is about 5525.7416696766. The cubic root of 30533821 is about 312.5554325132. Note that the first 3 decimals are identical.

The spelling of 30533821 in words is "thirty million, five hundred thirty-three thousand, eight hundred twenty-one".