201587021 has 2 divisors, whose sum is σ = 201587022. Its totient is φ = 201587020.

The previous prime is 201586999. The next prime is 201587069. The reversal of 201587021 is 120785102.

201587021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189062500 + 12524521 = 13750^2 + 3539^2 .

It is a cyclic number.

It is not a de Polignac number, because 201587021 - 2¹⁰ = 201585997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201587521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100793510 + 100793511.

It is an arithmetic number, because the mean of its divisors is an integer number (100793511).

Almost surely, 2^201587021 is an apocalyptic number.

It is an amenable number.

201587021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201587021 is an equidigital number, since it uses as much as digits as its factorization.

201587021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 201587021 is about 14198.1344197046. The cubic root of 201587021 is about 586.3463000274.

The spelling of 201587021 in words is "two hundred one million, five hundred eighty-seven thousand, twenty-one".