42611021 has 2 divisors, whose sum is σ = 42611022. Its totient is φ = 42611020.

The previous prime is 42611017. The next prime is 42611069. The reversal of 42611021 is 12011624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27510025 + 15100996 = 5245^2 + 3886^2 .

It is a cyclic number.

It is not a de Polignac number, because 42611021 - 2² = 42611017 is a prime.

It is a super-2 number, since 2×42611021² = 3631398221324882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42611011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21305510 + 21305511.

It is an arithmetic number, because the mean of its divisors is an integer number (21305511).

Almost surely, 2^42611021 is an apocalyptic number.

It is an amenable number.

42611021 is a deficient number, since it is larger than the sum of its proper divisors (1).

42611021 is an equidigital number, since it uses as much as digits as its factorization.

42611021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 42611021 is about 6527.7117736616. The cubic root of 42611021 is about 349.2802105339.

Adding to 42611021 its reverse (12011624), we get a palindrome (54622645).

The spelling of 42611021 in words is "forty-two million, six hundred eleven thousand, twenty-one".