217133359381 has 4 divisors (see below), whose sum is σ = 217161467712. Its totient is φ = 217105251052.

The previous prime is 217133359321. The next prime is 217133359411. The reversal of 217133359381 is 183953331712.

It is a happy number.

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 217133359381 - 2¹⁷ = 217133228309 is a prime.

It is a super-2 number, since 2×217133359381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217133359321) 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, 14042575 + ... + 14058028.

It is an arithmetic number, because the mean of its divisors is an integer number (54290366928).

Almost surely, 2^217133359381 is an apocalyptic number.

It is an amenable number.

217133359381 is a deficient number, since it is larger than the sum of its proper divisors (28108331).

217133359381 is an equidigital number, since it uses as much as digits as its factorization.

217133359381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28108330.

The product of its digits is 408240, while the sum is 46.

The spelling of 217133359381 in words is "two hundred seventeen billion, one hundred thirty-three million, three hundred fifty-nine thousand, three hundred eighty-one".