213209233 has 2 divisors, whose sum is σ = 213209234. Its totient is φ = 213209232.

The previous prime is 213209231. The next prime is 213209261. The reversal of 213209233 is 332902312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201838849 + 11370384 = 14207^2 + 3372^2 .

It is a cyclic number.

It is not a de Polignac number, because 213209233 - 2¹ = 213209231 is a prime.

Together with 213209231, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 213209198 and 213209207.

It is not a weakly prime, because it can be changed into another prime (213209231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106604616 + 106604617.

It is an arithmetic number, because the mean of its divisors is an integer number (106604617).

Almost surely, 2^213209233 is an apocalyptic number.

It is an amenable number.

213209233 is a deficient number, since it is larger than the sum of its proper divisors (1).

213209233 is an equidigital number, since it uses as much as digits as its factorization.

213209233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 213209233 is about 14601.6859642988. The cubic root of 213209233 is about 597.4047471039.

The spelling of 213209233 in words is "two hundred thirteen million, two hundred nine thousand, two hundred thirty-three".