820584021099 has 8 divisors (see below), whose sum is σ = 1094698062400. Its totient is φ = 546762996936.

The previous prime is 820584021079. The next prime is 820584021107. The reversal of 820584021099 is 990120485028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 820584021099 - 2¹³ = 820584012907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820584021079) 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, 73247749 + ... + 73258950.

It is an arithmetic number, because the mean of its divisors is an integer number (136837257800).

Almost surely, 2^820584021099 is an apocalyptic number.

820584021099 is a deficient number, since it is larger than the sum of its proper divisors (274114041301).

820584021099 is a wasteful number, since it uses less digits than its factorization.

820584021099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146508569.

The product of its (nonzero) digits is 414720, while the sum is 48.

The spelling of 820584021099 in words is "eight hundred twenty billion, five hundred eighty-four million, twenty-one thousand, ninety-nine".