1830204821 has 2 divisors, whose sum is σ = 1830204822. Its totient is φ = 1830204820.

The previous prime is 1830204809. The next prime is 1830204907. The reversal of 1830204821 is 1284020381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1445064196 + 385140625 = 38014^2 + 19625^2 .

It is a cyclic number.

It is not a de Polignac number, because 1830204821 - 2¹⁸ = 1829942677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1830204221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 915102410 + 915102411.

It is an arithmetic number, because the mean of its divisors is an integer number (915102411).

Almost surely, 2^1830204821 is an apocalyptic number.

It is an amenable number.

1830204821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1830204821 is an equidigital number, since it uses as much as digits as its factorization.

1830204821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 1830204821 is about 42780.8931767442. The cubic root of 1830204821 is about 1223.2068327066.

The spelling of 1830204821 in words is "one billion, eight hundred thirty million, two hundred four thousand, eight hundred twenty-one".