213140321 has 2 divisors, whose sum is σ = 213140322. Its totient is φ = 213140320.

The previous prime is 213140311. The next prime is 213140329. The reversal of 213140321 is 123041312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212110096 + 1030225 = 14564^2 + 1015^2 .

It is a cyclic number.

It is not a de Polignac number, because 213140321 - 2¹⁸ = 212878177 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213140321.

It is not a weakly prime, because it can be changed into another prime (213140329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106570160 + 106570161.

It is an arithmetic number, because the mean of its divisors is an integer number (106570161).

Almost surely, 2^213140321 is an apocalyptic number.

It is an amenable number.

213140321 is a deficient number, since it is larger than the sum of its proper divisors (1).

213140321 is an equidigital number, since it uses as much as digits as its factorization.

213140321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 213140321 is about 14599.3260460886. The cubic root of 213140321 is about 597.3403771709.

Adding to 213140321 its reverse (123041312), we get a palindrome (336181633).

Subtracting from 213140321 its reverse (123041312), we obtain a palindrome (90099009).

The spelling of 213140321 in words is "two hundred thirteen million, one hundred forty thousand, three hundred twenty-one".