4499842021 has 2 divisors, whose sum is σ = 4499842022. Its totient is φ = 4499842020.

The previous prime is 4499842019. The next prime is 4499842033. The reversal of 4499842021 is 1202489944.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3068052100 + 1431789921 = 55390^2 + 37839^2 .

It is a cyclic number.

It is not a de Polignac number, because 4499842021 - 2¹ = 4499842019 is a prime.

Together with 4499842019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4499848021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2249921010 + 2249921011.

It is an arithmetic number, because the mean of its divisors is an integer number (2249921011).

Almost surely, 2^4499842021 is an apocalyptic number.

It is an amenable number.

4499842021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4499842021 is an equidigital number, since it uses as much as digits as its factorization.

4499842021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 4499842021 is about 67080.8618087156. The cubic root of 4499842021 is about 1650.9443044003.

The spelling of 4499842021 in words is "four billion, four hundred ninety-nine million, eight hundred forty-two thousand, twenty-one".