201021071 has 2 divisors, whose sum is σ = 201021072. Its totient is φ = 201021070.

The previous prime is 201021043. The next prime is 201021089. The reversal of 201021071 is 170120102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201021071 - 2¹⁰ = 201020047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201021091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510535 + 100510536.

It is an arithmetic number, because the mean of its divisors is an integer number (100510536).

Almost surely, 2^201021071 is an apocalyptic number.

201021071 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021071 is an equidigital number, since it uses as much as digits as its factorization.

201021071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 201021071 is about 14178.1899761570. The cubic root of 201021071 is about 585.7970687020.

Adding to 201021071 its reverse (170120102), we get a palindrome (371141173).

The spelling of 201021071 in words is "two hundred one million, twenty-one thousand, seventy-one".