180371021 has 2 divisors, whose sum is σ = 180371022. Its totient is φ = 180371020.

The previous prime is 180371017. The next prime is 180371053. The reversal of 180371021 is 120173081.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161544100 + 18826921 = 12710^2 + 4339^2 .

It is a cyclic number.

It is not a de Polignac number, because 180371021 - 2² = 180371017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180373021) 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, 90185510 + 90185511.

It is an arithmetic number, because the mean of its divisors is an integer number (90185511).

Almost surely, 2^180371021 is an apocalyptic number.

It is an amenable number.

180371021 is a deficient number, since it is larger than the sum of its proper divisors (1).

180371021 is an equidigital number, since it uses as much as digits as its factorization.

180371021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 180371021 is about 13430.2278833980. The cubic root of 180371021 is about 565.0092890111.

The spelling of 180371021 in words is "one hundred eighty million, three hundred seventy-one thousand, twenty-one".