4166443021 has 12 divisors (see below), whose sum is σ = 4667169780. Its totient is φ = 3713324160.

The previous prime is 4166443019. The next prime is 4166443027. The reversal of 4166443021 is 1203446614.

It can be written as a sum of positive squares in 6 ways, for example, as 11222500 + 4155220521 = 3350^2 + 64461^2 .

It is not a de Polignac number, because 4166443021 - 2¹ = 4166443019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4166443027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 420160 + ... + 429961.

It is an arithmetic number, because the mean of its divisors is an integer number (388930815).

Almost surely, 2^4166443021 is an apocalyptic number.

It is an amenable number.

4166443021 is a deficient number, since it is larger than the sum of its proper divisors (500726759).

4166443021 is a wasteful number, since it uses less digits than its factorization.

4166443021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850176 (or 850163 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 4166443021 is about 64547.9900616588. The cubic root of 4166443021 is about 1609.1201834920.

Adding to 4166443021 its reverse (1203446614), we get a palindrome (5369889635).

The spelling of 4166443021 in words is "four billion, one hundred sixty-six million, four hundred forty-three thousand, twenty-one".