4978912321 has 4 divisors (see below), whose sum is σ = 5030241412. Its totient is φ = 4927583232.

The previous prime is 4978912283. The next prime is 4978912333. The reversal of 4978912321 is 1232198794.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2218881025 + 2760031296 = 47105^2 + 52536^2 .

It is a cyclic number.

It is not a de Polignac number, because 4978912321 - 2²³ = 4970523713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4978912021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25664400 + ... + 25664593.

It is an arithmetic number, because the mean of its divisors is an integer number (1257560353).

Almost surely, 2^4978912321 is an apocalyptic number.

It is an amenable number.

4978912321 is a deficient number, since it is larger than the sum of its proper divisors (51329091).

4978912321 is an equidigital number, since it uses as much as digits as its factorization.

4978912321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51329090.

The product of its digits is 217728, while the sum is 46.

The square root of 4978912321 is about 70561.4081563003. The cubic root of 4978912321 is about 1707.5685975469.

The spelling of 4978912321 in words is "four billion, nine hundred seventy-eight million, nine hundred twelve thousand, three hundred twenty-one".