21241086 has 16 divisors (see below), whose sum is σ = 43386624. Its totient is φ = 6929624.

The previous prime is 21241081. The next prime is 21241091. The reversal of 21241086 is 68014212.

It is an interprime number because it is at equal distance from previous prime (21241081) and next prime (21241091).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37380 + ... + 37943.

It is an arithmetic number, because the mean of its divisors is an integer number (2711664).

Almost surely, 2^21241086 is an apocalyptic number.

21241086 is an abundant number, since it is smaller than the sum of its proper divisors (22145538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21241086 is a wasteful number, since it uses less digits than its factorization.

21241086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75375.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21241086 is about 4608.8052681796. The cubic root of 21241086 is about 276.9441776063.

Adding to 21241086 its reverse (68014212), we get a palindrome (89255298).

The spelling of 21241086 in words is "twenty-one million, two hundred forty-one thousand, eighty-six".