217071084381 has 8 divisors (see below), whose sum is σ = 289433975424. Its totient is φ = 144711124800.

The previous prime is 217071084367. The next prime is 217071084383. The reversal of 217071084381 is 183480170712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 217071084381 - 2¹⁸ = 217070822237 is a prime.

It is a super-2 number, since 2×217071084381² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217071084383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 553836 + ... + 860741.

It is an arithmetic number, because the mean of its divisors is an integer number (36179246928).

Almost surely, 2^217071084381 is an apocalyptic number.

It is an amenable number.

217071084381 is a deficient number, since it is larger than the sum of its proper divisors (72362891043).

217071084381 is a wasteful number, since it uses less digits than its factorization.

217071084381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465731.

The product of its (nonzero) digits is 75264, while the sum is 42.

The spelling of 217071084381 in words is "two hundred seventeen billion, seventy-one million, eighty-four thousand, three hundred eighty-one".