98515393021 has 4 divisors (see below), whose sum is σ = 98516058844. Its totient is φ = 98514727200.

The previous prime is 98515393003. The next prime is 98515393027. The reversal of 98515393021 is 12039351589.

98515393021 is a nontrivial binomial coefficient, being equal to C(443882, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 96069002500 + 2446390521 = 309950^2 + 49461^2 .

It is a 3-Lehmer number, since φ(98515393021) divides (98515393021-1)³.

It is a cyclic number.

It is not a de Polignac number, because 98515393021 - 2⁷ = 98515392893 is a prime.

It is a deceptive number, since it divides R_98515393020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98515393027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 443881.

It is an arithmetic number, because the mean of its divisors is an integer number (24629014711).

It is a Poulet number, since it divides 2^98515393020-1.

Almost surely, 2^98515393021 is an apocalyptic number.

98515393021 is the 443881-st triangular number and also the 221941-st hexagonal number.

98515393021 is the 147961-st centered nonagonal number.

It is an amenable number.

98515393021 is a deficient number, since it is larger than the sum of its proper divisors (665823).

98515393021 is a wasteful number, since it uses less digits than its factorization.

98515393021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665822.

The product of its (nonzero) digits is 291600, while the sum is 46.

It can be divided in two parts, 98515 and 393021, that added together give a triangular number (491536 = T₉₉₁).

The spelling of 98515393021 in words is "ninety-eight billion, five hundred fifteen million, three hundred ninety-three thousand, twenty-one".