210020087 has 2 divisors, whose sum is σ = 210020088. Its totient is φ = 210020086.

The previous prime is 210020047. The next prime is 210020101. The reversal of 210020087 is 780020012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 210020087 - 2¹² = 210015991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210020047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010043 + 105010044.

It is an arithmetic number, because the mean of its divisors is an integer number (105010044).

Almost surely, 2^210020087 is an apocalyptic number.

210020087 is a deficient number, since it is larger than the sum of its proper divisors (1).

210020087 is an equidigital number, since it uses as much as digits as its factorization.

210020087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 210020087 is about 14492.0697969614. The cubic root of 210020087 is about 594.4111463483.

Adding to 210020087 its reverse (780020012), we get a palindrome (990040099).

The spelling of 210020087 in words is "two hundred ten million, twenty thousand, eighty-seven".