230521021 has 2 divisors, whose sum is σ = 230521022. Its totient is φ = 230521020.

The previous prime is 230520967. The next prime is 230521043. The reversal of 230521021 is 120125032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228432996 + 2088025 = 15114^2 + 1445^2 .

It is a cyclic number.

It is not a de Polignac number, because 230521021 - 2⁹ = 230520509 is a prime.

It is a super-2 number, since 2×230521021² = 106279882245764882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 230520986 and 230521004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (230521051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115260510 + 115260511.

It is an arithmetic number, because the mean of its divisors is an integer number (115260511).

Almost surely, 2^230521021 is an apocalyptic number.

It is an amenable number.

230521021 is a deficient number, since it is larger than the sum of its proper divisors (1).

230521021 is an equidigital number, since it uses as much as digits as its factorization.

230521021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 230521021 is about 15182.9187246721. The cubic root of 230521021 is about 613.1548645502.

Adding to 230521021 its reverse (120125032), we get a palindrome (350646053).

The spelling of 230521021 in words is "two hundred thirty million, five hundred twenty-one thousand, twenty-one".