7217684375421 has 8 divisors (see below), whose sum is σ = 10363854487840. Its totient is φ = 4441651923312.

The previous prime is 7217684375333. The next prime is 7217684375449. The reversal of 7217684375421 is 1245734867127.

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

It is not a de Polignac number, because 7217684375421 - 2¹⁵ = 7217684342653 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 (7217684375491) 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, 92534415031 + ... + 92534415108.

It is an arithmetic number, because the mean of its divisors is an integer number (1295481810980).

Almost surely, 2^{7217684375421} is an apocalyptic number.

It is an amenable number.

7217684375421 is a deficient number, since it is larger than the sum of its proper divisors (3146170112419).

7217684375421 is a wasteful number, since it uses less digits than its factorization.

7217684375421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185068830155.

The product of its digits is 15805440, while the sum is 57.

The spelling of 7217684375421 in words is "seven trillion, two hundred seventeen billion, six hundred eighty-four million, three hundred seventy-five thousand, four hundred twenty-one".