213645052361 has 8 divisors (see below), whose sum is σ = 232451239944. Its totient is φ = 195177715200.

The previous prime is 213645052349. The next prime is 213645052363. The reversal of 213645052361 is 163250546312.

It can be written as a sum of positive squares in 4 ways, for example, as 3829753225 + 209815299136 = 61885^2 + 458056^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213645052361 - 2³⁰ = 212571310537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213645052363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84711290 + ... + 84713811.

It is an arithmetic number, because the mean of its divisors is an integer number (29056404993).

Almost surely, 2^213645052361 is an apocalyptic number.

It is an amenable number.

213645052361 is a deficient number, since it is larger than the sum of its proper divisors (18806187583).

213645052361 is a wasteful number, since it uses less digits than its factorization.

213645052361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169425211.

The product of its (nonzero) digits is 129600, while the sum is 38.

Adding to 213645052361 its reverse (163250546312), we get a palindrome (376895598673).

The spelling of 213645052361 in words is "two hundred thirteen billion, six hundred forty-five million, fifty-two thousand, three hundred sixty-one".