41621821 has 2 divisors, whose sum is σ = 41621822. Its totient is φ = 41621820.

The previous prime is 41621773. The next prime is 41621843. The reversal of 41621821 is 12812614.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41602500 + 19321 = 6450^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 41621821 - 2⁷ = 41621693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41621891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20810910 + 20810911.

It is an arithmetic number, because the mean of its divisors is an integer number (20810911).

Almost surely, 2^41621821 is an apocalyptic number.

It is an amenable number.

41621821 is a deficient number, since it is larger than the sum of its proper divisors (1).

41621821 is an equidigital number, since it uses as much as digits as its factorization.

41621821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 25.

The square root of 41621821 is about 6451.4975780822. The cubic root of 41621821 is about 346.5562155321.

The spelling of 41621821 in words is "forty-one million, six hundred twenty-one thousand, eight hundred twenty-one".