9876654432221 has 2 divisors, whose sum is σ = 9876654432222. Its totient is φ = 9876654432220.

The previous prime is 9876654432217. The next prime is 9876654432247. The reversal of 9876654432221 is 1222344566789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9779317296100 + 97337136121 = 3127190^2 + 311989^2 .

It is a cyclic number.

It is not a de Polignac number, because 9876654432221 - 2² = 9876654432217 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9876654438221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4938327216110 + 4938327216111.

It is an arithmetic number, because the mean of its divisors is an integer number (4938327216111).

Almost surely, 2^{9876654432221} is an apocalyptic number.

It is an amenable number.

9876654432221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9876654432221 is an equidigital number, since it uses as much as digits as its factorization.

9876654432221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34836480, while the sum is 59.

The spelling of 9876654432221 in words is "nine trillion, eight hundred seventy-six billion, six hundred fifty-four million, four hundred thirty-two thousand, two hundred twenty-one".