213530281 has 2 divisors, whose sum is σ = 213530282. Its totient is φ = 213530280.

The previous prime is 213530279. The next prime is 213530323. The reversal of 213530281 is 182035312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212693056 + 837225 = 14584^2 + 915^2 .

It is a cyclic number.

It is not a de Polignac number, because 213530281 - 2¹ = 213530279 is a prime.

It is a super-2 number, since 2×213530281² = 91190361807877922, which contains 22 as substring.

Together with 213530279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (213530221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106765140 + 106765141.

It is an arithmetic number, because the mean of its divisors is an integer number (106765141).

Almost surely, 2^213530281 is an apocalyptic number.

It is an amenable number.

213530281 is a deficient number, since it is larger than the sum of its proper divisors (1).

213530281 is an equidigital number, since it uses as much as digits as its factorization.

213530281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 213530281 is about 14612.6753539521. The cubic root of 213530281 is about 597.7044517792.

Adding to 213530281 its reverse (182035312), we get a palindrome (395565593).

The spelling of 213530281 in words is "two hundred thirteen million, five hundred thirty thousand, two hundred eighty-one".