9876531421 has 8 divisors (see below), whose sum is σ = 10276165080. Its totient is φ = 9480835392.

The previous prime is 9876531419. The next prime is 9876531473. The reversal of 9876531421 is 1241356789.

9876531421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5033902500 + 4842628921 = 70950^2 + 69589^2 .

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 9876531421 - 2¹ = 9876531419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9876531121) 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, 979290 + ... + 989323.

It is an arithmetic number, because the mean of its divisors is an integer number (1284520635).

Almost surely, 2^9876531421 is an apocalyptic number.

It is an amenable number.

9876531421 is a deficient number, since it is larger than the sum of its proper divisors (399633659).

9876531421 is a wasteful number, since it uses less digits than its factorization.

9876531421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968815.

The product of its digits is 362880, while the sum is 46.

The square root of 9876531421 is about 99380.7396883320. The cubic root of 9876531421 is about 2145.5311121373.

The spelling of 9876531421 in words is "nine billion, eight hundred seventy-six million, five hundred thirty-one thousand, four hundred twenty-one".