201043021 has 2 divisors, whose sum is σ = 201043022. Its totient is φ = 201043020.

The previous prime is 201042997. The next prime is 201043027. The reversal of 201043021 is 120340102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190053796 + 10989225 = 13786^2 + 3315^2 .

It is a cyclic number.

It is not a de Polignac number, because 201043021 - 2²¹ = 198945869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201042992 and 201043010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201043027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100521510 + 100521511.

It is an arithmetic number, because the mean of its divisors is an integer number (100521511).

Almost surely, 2^201043021 is an apocalyptic number.

It is an amenable number.

201043021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201043021 is an equidigital number, since it uses as much as digits as its factorization.

201043021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 201043021 is about 14178.9640312683. The cubic root of 201043021 is about 585.8183894813.

Adding to 201043021 its reverse (120340102), we get a palindrome (321383123).

The spelling of 201043021 in words is "two hundred one million, forty-three thousand, twenty-one".