478799896021 has 4 divisors (see below), whose sum is σ = 478801364652. Its totient is φ = 478798427392.

The previous prime is 478799896019. The next prime is 478799896031. The reversal of 478799896021 is 120698997874.

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 465961872996 + 12838023025 = 682614^2 + 113305^2 .

It is a cyclic number.

It is not a de Polignac number, because 478799896021 - 2¹ = 478799896019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478799896031) 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, 1546 + ... + 978571.

It is an arithmetic number, because the mean of its divisors is an integer number (119700341163).

Almost surely, 2^478799896021 is an apocalyptic number.

It is an amenable number.

478799896021 is a deficient number, since it is larger than the sum of its proper divisors (1468631).

478799896021 is an equidigital number, since it uses as much as digits as its factorization.

478799896021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468630.

The product of its (nonzero) digits is 109734912, while the sum is 70.

The spelling of 478799896021 in words is "four hundred seventy-eight billion, seven hundred ninety-nine million, eight hundred ninety-six thousand, twenty-one".