9821428499 has 8 divisors (see below), whose sum is σ = 9928377360. Its totient is φ = 9715056736.

The previous prime is 9821428489. The next prime is 9821428511. The reversal of 9821428499 is 9948241289.

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 9821428499 - 2³² = 5526461203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9821428439) 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, 110009 + ... + 178170.

It is an arithmetic number, because the mean of its divisors is an integer number (1241047170).

Almost surely, 2^9821428499 is an apocalyptic number.

9821428499 is a deficient number, since it is larger than the sum of its proper divisors (106948861).

9821428499 is a wasteful number, since it uses less digits than its factorization.

9821428499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288549.

The product of its digits is 2985984, while the sum is 56.

The square root of 9821428499 is about 99103.1205310912. The cubic root of 9821428499 is about 2141.5335689159.

The spelling of 9821428499 in words is "nine billion, eight hundred twenty-one million, four hundred twenty-eight thousand, four hundred ninety-nine".