215205135361 has 4 divisors (see below), whose sum is σ = 215211166000. Its totient is φ = 215199104724.

The previous prime is 215205135337. The next prime is 215205135377. The reversal of 215205135361 is 163531502512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215205135361 - 2¹³ = 215205127169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215205135331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2961471 + ... + 3033268.

It is an arithmetic number, because the mean of its divisors is an integer number (53802791500).

Almost surely, 2^215205135361 is an apocalyptic number.

It is an amenable number.

215205135361 is a deficient number, since it is larger than the sum of its proper divisors (6030639).

215205135361 is an equidigital number, since it uses as much as digits as its factorization.

215205135361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6030638.

The product of its (nonzero) digits is 27000, while the sum is 34.

Adding to 215205135361 its reverse (163531502512), we get a palindrome (378736637873).

The spelling of 215205135361 in words is "two hundred fifteen billion, two hundred five million, one hundred thirty-five thousand, three hundred sixty-one".