41820021 has 24 divisors (see below), whose sum is σ = 62441496. Its totient is φ = 26956800.

The previous prime is 41820013. The next prime is 41820043. The reversal of 41820021 is 12002814.

It can be written as a sum of positive squares in 4 ways, for example, as 1179396 + 40640625 = 1086^2 + 6375^2 .

It is not a de Polignac number, because 41820021 - 2³ = 41820013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 41819976 and 41820003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41820061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34221 + ... + 35421.

It is an arithmetic number, because the mean of its divisors is an integer number (2601729).

Almost surely, 2^41820021 is an apocalyptic number.

It is an amenable number.

41820021 is a deficient number, since it is larger than the sum of its proper divisors (20621475).

41820021 is a wasteful number, since it uses less digits than its factorization.

41820021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333 (or 1330 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 41820021 is about 6466.8401093579. The cubic root of 41820021 is about 347.1054362665.

Adding to 41820021 its reverse (12002814), we get a palindrome (53822835).

The spelling of 41820021 in words is "forty-one million, eight hundred twenty thousand, twenty-one".