4458998021 has 2 divisors, whose sum is σ = 4458998022. Its totient is φ = 4458998020.

The previous prime is 4458997987. The next prime is 4458998023. The reversal of 4458998021 is 1208998544.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4187901796 + 271096225 = 64714^2 + 16465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4458998021 is a prime.

Together with 4458998023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4458998023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2229499010 + 2229499011.

It is an arithmetic number, because the mean of its divisors is an integer number (2229499011).

Almost surely, 2^4458998021 is an apocalyptic number.

It is an amenable number.

4458998021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4458998021 is an equidigital number, since it uses as much as digits as its factorization.

4458998021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 50.

The square root of 4458998021 is about 66775.7292809296. The cubic root of 4458998021 is about 1645.9340379042.

The spelling of 4458998021 in words is "four billion, four hundred fifty-eight million, nine hundred ninety-eight thousand, twenty-one".