213511213 has 2 divisors, whose sum is σ = 213511214. Its totient is φ = 213511212.

The previous prime is 213511187. The next prime is 213511217. The reversal of 213511213 is 312115312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192598884 + 20912329 = 13878^2 + 4573^2 .

It is a cyclic number.

It is not a de Polignac number, because 213511213 - 2¹³ = 213503021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213511217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106755606 + 106755607.

It is an arithmetic number, because the mean of its divisors is an integer number (106755607).

Almost surely, 2^213511213 is an apocalyptic number.

It is an amenable number.

213511213 is a deficient number, since it is larger than the sum of its proper divisors (1).

213511213 is an equidigital number, since it uses as much as digits as its factorization.

213511213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 19.

The square root of 213511213 is about 14612.0228921255. The cubic root of 213511213 is about 597.6866598175.

Adding to 213511213 its reverse (312115312), we get a palindrome (525626525).

The spelling of 213511213 in words is "two hundred thirteen million, five hundred eleven thousand, two hundred thirteen".