201182021 has 2 divisors, whose sum is σ = 201182022. Its totient is φ = 201182020.

The previous prime is 201182017. The next prime is 201182027. The reversal of 201182021 is 120281102.

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., 123988225 + 77193796 = 11135^2 + 8786^2 .

It is a cyclic number.

It is not a de Polignac number, because 201182021 - 2² = 201182017 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201182027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100591010 + 100591011.

It is an arithmetic number, because the mean of its divisors is an integer number (100591011).

Almost surely, 2^201182021 is an apocalyptic number.

It is an amenable number.

201182021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201182021 is an equidigital number, since it uses as much as digits as its factorization.

201182021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 201182021 is about 14183.8648118205. The cubic root of 201182021 is about 585.9533688777.

The spelling of 201182021 in words is "two hundred one million, one hundred eighty-two thousand, twenty-one".