215104213 has 4 divisors (see below), whose sum is σ = 227757420. Its totient is φ = 202451008.

The previous prime is 215104207. The next prime is 215104217. The reversal of 215104213 is 312401512.

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 94148209 + 120956004 = 9703^2 + 10998^2 .

It is a cyclic number.

It is not a de Polignac number, because 215104213 - 2²¹ = 213007061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215104217) 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, 6326578 + ... + 6326611.

It is an arithmetic number, because the mean of its divisors is an integer number (56939355).

Almost surely, 2^215104213 is an apocalyptic number.

It is an amenable number.

215104213 is a deficient number, since it is larger than the sum of its proper divisors (12653207).

215104213 is a wasteful number, since it uses less digits than its factorization.

215104213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12653206.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 215104213 is about 14666.4315019026. The cubic root of 215104213 is about 599.1694183467.

Adding to 215104213 its reverse (312401512), we get a palindrome (527505725).

The spelling of 215104213 in words is "two hundred fifteen million, one hundred four thousand, two hundred thirteen".