217138098533 has 4 divisors (see below), whose sum is σ = 217151782080. Its totient is φ = 217124414988.

The previous prime is 217138098511. The next prime is 217138098553. The reversal of 217138098533 is 335890831712.

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 217138098533 - 2¹⁶ = 217138032997 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 (217138098553) 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, 6817943 + ... + 6849716.

It is an arithmetic number, because the mean of its divisors is an integer number (54287945520).

Almost surely, 2^217138098533 is an apocalyptic number.

It is an amenable number.

217138098533 is a deficient number, since it is larger than the sum of its proper divisors (13683547).

217138098533 is a wasteful number, since it uses less digits than its factorization.

217138098533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13683546.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 217138098533 in words is "two hundred seventeen billion, one hundred thirty-eight million, ninety-eight thousand, five hundred thirty-three".