213622361 has 4 divisors (see below), whose sum is σ = 213664692. Its totient is φ = 213580032.

The previous prime is 213622313. The next prime is 213622393. The reversal of 213622361 is 163226312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 151905625 + 61716736 = 12325^2 + 7856^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213622361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213622361.

It is not an unprimeable number, because it can be changed into a prime (213622261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12380 + ... + 24093.

It is an arithmetic number, because the mean of its divisors is an integer number (53416173).

Almost surely, 2^213622361 is an apocalyptic number.

It is an amenable number.

213622361 is a deficient number, since it is larger than the sum of its proper divisors (42331).

213622361 is an equidigital number, since it uses as much as digits as its factorization.

213622361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42330.

The product of its digits is 2592, while the sum is 26.

The square root of 213622361 is about 14615.8257036679. The cubic root of 213622361 is about 597.7903548441.

Adding to 213622361 its reverse (163226312), we get a palindrome (376848673).

The spelling of 213622361 in words is "two hundred thirteen million, six hundred twenty-two thousand, three hundred sixty-one".