180202021 has 2 divisors, whose sum is σ = 180202022. Its totient is φ = 180202020.

The previous prime is 180202013. The next prime is 180202049. The reversal of 180202021 is 120202081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94361796 + 85840225 = 9714^2 + 9265^2 .

It is an emirp because it is prime and its reverse (120202081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 180202021 - 2³ = 180202013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 180201986 and 180202004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180202051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90101010 + 90101011.

It is an arithmetic number, because the mean of its divisors is an integer number (90101011).

Almost surely, 2^180202021 is an apocalyptic number.

It is an amenable number.

180202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

180202021 is an equidigital number, since it uses as much as digits as its factorization.

180202021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 180202021 is about 13423.9346318432. The cubic root of 180202021 is about 564.8327706193.

The spelling of 180202021 in words is "one hundred eighty million, two hundred two thousand, twenty-one".