30822821 has 2 divisors, whose sum is σ = 30822822. Its totient is φ = 30822820.

The previous prime is 30822809. The next prime is 30822823. The reversal of 30822821 is 12822803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21520321 + 9302500 = 4639^2 + 3050^2 .

It is a cyclic number.

It is not a de Polignac number, because 30822821 - 2²² = 26628517 is a prime.

It is a Sophie Germain prime.

Together with 30822823, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30822823) 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, 15411410 + 15411411.

It is an arithmetic number, because the mean of its divisors is an integer number (15411411).

Almost surely, 2^30822821 is an apocalyptic number.

It is an amenable number.

30822821 is a deficient number, since it is larger than the sum of its proper divisors (1).

30822821 is an equidigital number, since it uses as much as digits as its factorization.

30822821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 30822821 is about 5551.8304188799. The cubic root of 30822821 is about 313.5384411059.

The spelling of 30822821 in words is "thirty million, eight hundred twenty-two thousand, eight hundred twenty-one".