210020231 has 2 divisors, whose sum is σ = 210020232. Its totient is φ = 210020230.

The previous prime is 210020221. The next prime is 210020249. The reversal of 210020231 is 132020012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210020231 - 2²² = 205825927 is a prime.

It is a super-2 number, since 2×210020231² = 88216994858586722, which contains 22 as substring.

It is a Sophie Germain 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 (210020221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010115 + 105010116.

It is an arithmetic number, because the mean of its divisors is an integer number (105010116).

Almost surely, 2^210020231 is an apocalyptic number.

210020231 is a deficient number, since it is larger than the sum of its proper divisors (1).

210020231 is an equidigital number, since it uses as much as digits as its factorization.

210020231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 210020231 is about 14492.0747651949. The cubic root of 210020231 is about 594.4112822007.

Adding to 210020231 its reverse (132020012), we get a palindrome (342040243).

The spelling of 210020231 in words is "two hundred ten million, twenty thousand, two hundred thirty-one".