98396821521 has 16 divisors (see below), whose sum is σ = 145805296000. Its totient is φ = 65583378864.

The previous prime is 98396821519. The next prime is 98396821531. The reversal of 98396821521 is 12512869389.

98396821521 is a `hidden beast` number, since 9 + 8 + 3 + 96 + 8 + 21 + 521 = 666.

It is not a de Polignac number, because 98396821521 - 2¹ = 98396821519 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (98396821511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277741 + ... + 523386.

It is an arithmetic number, because the mean of its divisors is an integer number (9112831000).

Almost surely, 2^98396821521 is an apocalyptic number.

It is an amenable number.

98396821521 is a deficient number, since it is larger than the sum of its proper divisors (47408474479).

98396821521 is a wasteful number, since it uses less digits than its factorization.

98396821521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805685 (or 805679 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The spelling of 98396821521 in words is "ninety-eight billion, three hundred ninety-six million, eight hundred twenty-one thousand, five hundred twenty-one".