21162041 has 2 divisors, whose sum is σ = 21162042. Its totient is φ = 21162040.

The previous prime is 21162019. The next prime is 21162107. The reversal of 21162041 is 14026112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12752041 + 8410000 = 3571^2 + 2900^2 .

It is a cyclic number.

It is not a de Polignac number, because 21162041 - 2¹⁰ = 21161017 is a prime.

It is not a weakly prime, because it can be changed into another prime (21162541) 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, 10581020 + 10581021.

It is an arithmetic number, because the mean of its divisors is an integer number (10581021).

Almost surely, 2^21162041 is an apocalyptic number.

It is an amenable number.

21162041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21162041 is an equidigital number, since it uses as much as digits as its factorization.

21162041 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 21162041 is about 4600.2218424767. The cubic root of 21162041 is about 276.6002174250.

Adding to 21162041 its reverse (14026112), we get a palindrome (35188153).

The spelling of 21162041 in words is "twenty-one million, one hundred sixty-two thousand, forty-one".