41561021 has 2 divisors, whose sum is σ = 41561022. Its totient is φ = 41561020.

The previous prime is 41561011. The next prime is 41561041. The reversal of 41561021 is 12016514.

It is an a-pointer prime, because the next prime (41561041) can be obtained adding 41561021 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36132121 + 5428900 = 6011^2 + 2330^2 .

It is a cyclic number.

It is not a de Polignac number, because 41561021 - 2¹⁴ = 41544637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 41560984 and 41561002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41561011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20780510 + 20780511.

It is an arithmetic number, because the mean of its divisors is an integer number (20780511).

Almost surely, 2^41561021 is an apocalyptic number.

It is an amenable number.

41561021 is a deficient number, since it is larger than the sum of its proper divisors (1).

41561021 is an equidigital number, since it uses as much as digits as its factorization.

41561021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 41561021 is about 6446.7837717733. The cubic root of 41561021 is about 346.3873867341.

Adding to 41561021 its reverse (12016514), we get a palindrome (53577535).

The spelling of 41561021 in words is "forty-one million, five hundred sixty-one thousand, twenty-one".