18059021 has 2 divisors, whose sum is σ = 18059022. Its totient is φ = 18059020.

The previous prime is 18058991. The next prime is 18059033. The reversal of 18059021 is 12095081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17682025 + 376996 = 4205^2 + 614^2 .

It is an emirp because it is prime and its reverse (12095081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18059021 - 2¹⁰ = 18057997 is a prime.

It is a super-2 number, since 2×18059021² = 652256478956882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18059221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9029510 + 9029511.

It is an arithmetic number, because the mean of its divisors is an integer number (9029511).

Almost surely, 2^18059021 is an apocalyptic number.

It is an amenable number.

18059021 is a deficient number, since it is larger than the sum of its proper divisors (1).

18059021 is an equidigital number, since it uses as much as digits as its factorization.

18059021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 18059021 is about 4249.5906861720. The cubic root of 18059021 is about 262.3602690951.

The spelling of 18059021 in words is "eighteen million, fifty-nine thousand, twenty-one".