7987654433221 has 8 divisors (see below), whose sum is σ = 8004966856704. Its totient is φ = 7970345742960.

The previous prime is 7987654433203. The next prime is 7987654433251. The reversal of 7987654433221 is 1223344567897.

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

It is a cyclic number.

It is not a de Polignac number, because 7987654433221 - 2²³ = 7987646044613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7987654433221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7987654433251) 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, 3372051 + ... + 5229343.

It is an arithmetic number, because the mean of its divisors is an integer number (1000620857088).

Almost surely, 2^{7987654433221} is an apocalyptic number.

It is an amenable number.

7987654433221 is a deficient number, since it is larger than the sum of its proper divisors (17312423483).

7987654433221 is a wasteful number, since it uses less digits than its factorization.

7987654433221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866611.

The product of its digits is 60963840, while the sum is 61.

The spelling of 7987654433221 in words is "seven trillion, nine hundred eighty-seven billion, six hundred fifty-four million, four hundred thirty-three thousand, two hundred twenty-one".