9821428500 has 96 divisors (see below), whose sum is σ = 30800060928. Its totient is φ = 2417577600.

The previous prime is 9821428489. The next prime is 9821428511. The reversal of 9821428500 is 58241289.

It is an interprime number because it is at equal distance from previous prime (9821428489) and next prime (9821428511).

It is a super-2 number, since 2×9821428500² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232332 + ... + 271331.

It is an arithmetic number, because the mean of its divisors is an integer number (320833968).

Almost surely, 2^9821428500 is an apocalyptic number.

It is an amenable number.

9821428500 is an abundant number, since it is smaller than the sum of its proper divisors (20978632428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9821428500 is a wasteful number, since it uses less digits than its factorization.

9821428500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503698 (or 503686 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 9821428500 is about 99103.1205361365. The cubic root of 9821428500 is about 2141.5335689886.

Adding to 9821428500 its reverse (58241289), we get a palindrome (9879669789).

The spelling of 9821428500 in words is "nine billion, eight hundred twenty-one million, four hundred twenty-eight thousand, five hundred".