213020231 has 2 divisors, whose sum is σ = 213020232. Its totient is φ = 213020230.

The previous prime is 213020161. The next prime is 213020233. The reversal of 213020231 is 132020312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213020231 - 2¹⁰ = 213019207 is a prime.

It is a super-2 number, since 2×213020231² = 90755237630586722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 213020233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213020233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106510115 + 106510116.

It is an arithmetic number, because the mean of its divisors is an integer number (106510116).

Almost surely, 2^213020231 is an apocalyptic number.

213020231 is a deficient number, since it is larger than the sum of its proper divisors (1).

213020231 is an equidigital number, since it uses as much as digits as its factorization.

213020231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 213020231 is about 14595.2126055087. The cubic root of 213020231 is about 597.2281692723.

Adding to 213020231 its reverse (132020312), we get a palindrome (345040543).

The spelling of 213020231 in words is "two hundred thirteen million, twenty thousand, two hundred thirty-one".