217215011 has 8 divisors (see below), whose sum is σ = 246235920. Its totient is φ = 189952992.

The previous prime is 217214999. The next prime is 217215043. The reversal of 217215011 is 110512712.

It is a happy number.

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 217215011 - 2⁶ = 217214947 is a prime.

It is a super-2 number, since 2×217215011² = 94364722007460242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217215071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439460 + ... + 439953.

It is an arithmetic number, because the mean of its divisors is an integer number (30779490).

Almost surely, 2^217215011 is an apocalyptic number.

217215011 is a deficient number, since it is larger than the sum of its proper divisors (29020909).

217215011 is a wasteful number, since it uses less digits than its factorization.

217215011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879445.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 217215011 is about 14738.2160046595. The cubic root of 217215011 is about 601.1229073393.

Adding to 217215011 its reverse (110512712), we get a palindrome (327727723).

The spelling of 217215011 in words is "two hundred seventeen million, two hundred fifteen thousand, eleven".