213546253117 has 4 divisors (see below), whose sum is σ = 226107797436. Its totient is φ = 200984708800.

The previous prime is 213546253091. The next prime is 213546253127. The reversal of 213546253117 is 711352645312.

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 77646379801 + 135899873316 = 278651^2 + 368646^2 .

It is a cyclic number.

It is not a de Polignac number, because 213546253117 - 2¹¹ = 213546251069 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 213546253117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213546253127) 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, 6280772134 + ... + 6280772167.

It is an arithmetic number, because the mean of its divisors is an integer number (56526949359).

Almost surely, 2^213546253117 is an apocalyptic number.

It is an amenable number.

213546253117 is a deficient number, since it is larger than the sum of its proper divisors (12561544319).

213546253117 is a wasteful number, since it uses less digits than its factorization.

213546253117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12561544318.

The product of its digits is 151200, while the sum is 40.

Adding to 213546253117 its reverse (711352645312), we get a palindrome (924898898429).

The spelling of 213546253117 in words is "two hundred thirteen billion, five hundred forty-six million, two hundred fifty-three thousand, one hundred seventeen".