4447493821 has 2 divisors, whose sum is σ = 4447493822. Its totient is φ = 4447493820.

The previous prime is 4447493803. The next prime is 4447493839. The reversal of 4447493821 is 1283947444.

4447493821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (4447493803) and next prime (4447493839).

It can be written as a sum of positive squares in only one way, i.e., 2566536921 + 1880956900 = 50661^2 + 43370^2 .

It is a cyclic number.

It is not a de Polignac number, because 4447493821 - 2⁵ = 4447493789 is a prime.

It is a super-3 number, since 3×4447493821³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4447493851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2223746910 + 2223746911.

It is an arithmetic number, because the mean of its divisors is an integer number (2223746911).

Almost surely, 2^4447493821 is an apocalyptic number.

It is an amenable number.

4447493821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4447493821 is an equidigital number, since it uses as much as digits as its factorization.

4447493821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 46.

The square root of 4447493821 is about 66689.5330692906. The cubic root of 4447493821 is about 1644.5173173867.

The spelling of 4447493821 in words is "four billion, four hundred forty-seven million, four hundred ninety-three thousand, eight hundred twenty-one".