104863509821 has 12 divisors (see below), whose sum is σ = 124959306780. Its totient is φ = 87690738240.

The previous prime is 104863509809. The next prime is 104863509833. The reversal of 104863509821 is 128905368401.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (104863509809) and next prime (104863509833).

It can be written as a sum of positive squares in 2 ways, for example, as 10881410596 + 93982099225 = 104314^2 + 306565^2 .

It is not a de Polignac number, because 104863509821 - 2³⁴ = 87683640637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (104863503821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26096426 + ... + 26100443.

It is an arithmetic number, because the mean of its divisors is an integer number (10413275565).

Almost surely, 2^104863509821 is an apocalyptic number.

It is an amenable number.

104863509821 is a deficient number, since it is larger than the sum of its proper divisors (20095796959).

104863509821 is an equidigital number, since it uses as much as digits as its factorization.

104863509821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52196924 (or 52196917 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 104863509821 in words is "one hundred four billion, eight hundred sixty-three million, five hundred nine thousand, eight hundred twenty-one".