213545217 has 8 divisors (see below), whose sum is σ = 285810624. Its totient is φ = 141821648.

The previous prime is 213545203. The next prime is 213545231. The reversal of 213545217 is 712545312.

It is an interprime number because it is at equal distance from previous prime (213545203) and next prime (213545231).

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

It is a cyclic number.

It is not a de Polignac number, because 213545217 - 2⁷ = 213545089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213545287) 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, 134538 + ... + 136115.

It is an arithmetic number, because the mean of its divisors is an integer number (35726328).

Almost surely, 2^213545217 is an apocalyptic number.

It is an amenable number.

213545217 is a deficient number, since it is larger than the sum of its proper divisors (72265407).

213545217 is a wasteful number, since it uses less digits than its factorization.

213545217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270919.

The product of its digits is 8400, while the sum is 30.

The square root of 213545217 is about 14613.1864081726. The cubic root of 213545217 is about 597.7183875163.

The spelling of 213545217 in words is "two hundred thirteen million, five hundred forty-five thousand, two hundred seventeen".