217145033 has 4 divisors (see below), whose sum is σ = 248165760. Its totient is φ = 186124308.

The previous prime is 217145017. The next prime is 217145039. The reversal of 217145033 is 330541712.

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 217145033 - 2⁴ = 217145017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217144993 and 217145011.

It is not an unprimeable number, because it can be changed into a prime (217145039) 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, 15510353 + ... + 15510366.

It is an arithmetic number, because the mean of its divisors is an integer number (62041440).

Almost surely, 2^217145033 is an apocalyptic number.

It is an amenable number.

217145033 is a deficient number, since it is larger than the sum of its proper divisors (31020727).

217145033 is an equidigital number, since it uses as much as digits as its factorization.

217145033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31020726.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 217145033 is about 14735.8417811810. The cubic root of 217145033 is about 601.0583478096.

Adding to 217145033 its reverse (330541712), we get a palindrome (547686745).

The spelling of 217145033 in words is "two hundred seventeen million, one hundred forty-five thousand, thirty-three".