215958213 has 6 divisors (see below), whose sum is σ = 311939654. Its totient is φ = 143972136.

The previous prime is 215958209. The next prime is 215958217. The reversal of 215958213 is 312859512.

215958213 is a `hidden beast` number, since 21 + 59 + 582 + 1 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (215958209) and next prime (215958217).

It can be written as a sum of positive squares in only one way, i.e., 162639009 + 53319204 = 12753^2 + 7302^2 .

It is not a de Polignac number, because 215958213 - 2² = 215958209 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 (215958217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11997670 + ... + 11997687.

Almost surely, 2^215958213 is an apocalyptic number.

It is an amenable number.

215958213 is a deficient number, since it is larger than the sum of its proper divisors (95981441).

215958213 is a wasteful number, since it uses less digits than its factorization.

215958213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23995363 (or 23995360 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 215958213 is about 14695.5167653268. The cubic root of 215958213 is about 599.9613058380.

The spelling of 215958213 in words is "two hundred fifteen million, nine hundred fifty-eight thousand, two hundred thirteen".