217212051011 has 4 divisors (see below), whose sum is σ = 217213701792. Its totient is φ = 217210400232.

The previous prime is 217212050987. The next prime is 217212051019. The reversal of 217212051011 is 110150212712.

It is a happy number.

217212051011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 217212051011 - 2⁶ = 217212050947 is a prime.

It is a super-2 number, since 2×217212051011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217212051019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609131 + ... + 897476.

It is an arithmetic number, because the mean of its divisors is an integer number (54303425448).

Almost surely, 2^217212051011 is an apocalyptic number.

217212051011 is a deficient number, since it is larger than the sum of its proper divisors (1650781).

217212051011 is a wasteful number, since it uses less digits than its factorization.

217212051011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650780.

The product of its (nonzero) digits is 280, while the sum is 23.

Adding to 217212051011 its reverse (110150212712), we get a palindrome (327362263723).

The spelling of 217212051011 in words is "two hundred seventeen billion, two hundred twelve million, fifty-one thousand, eleven".