217215397519 has 4 divisors (see below), whose sum is σ = 217216993696. Its totient is φ = 217213801344.

The previous prime is 217215397493. The next prime is 217215397571. The reversal of 217215397519 is 915793512712.

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 217215397519 - 2²⁹ = 216678526607 is a prime.

It is a super-2 number, since 2×217215397519² (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 (217215392519) 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, 572754 + ... + 873199.

It is an arithmetic number, because the mean of its divisors is an integer number (54304248424).

Almost surely, 2^217215397519 is an apocalyptic number.

217215397519 is a deficient number, since it is larger than the sum of its proper divisors (1596177).

217215397519 is a wasteful number, since it uses less digits than its factorization.

217215397519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596176.

The product of its digits is 1190700, while the sum is 52.

The spelling of 217215397519 in words is "two hundred seventeen billion, two hundred fifteen million, three hundred ninety-seven thousand, five hundred nineteen".