21244076 has 24 divisors (see below), whose sum is σ = 42586656. Its totient is φ = 9083520.

The previous prime is 21244073. The next prime is 21244121. The reversal of 21244076 is 67044212.

It is not an unprimeable number, because it can be changed into a prime (21244073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20810 + ... + 21806.

It is an arithmetic number, because the mean of its divisors is an integer number (1774444).

Almost surely, 2^21244076 is an apocalyptic number.

It is an amenable number.

21244076 is an abundant number, since it is smaller than the sum of its proper divisors (21342580).

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

21244076 is a wasteful number, since it uses less digits than its factorization.

21244076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 21244076 is about 4609.1296358423. The cubic root of 21244076 is about 276.9571716726.

Adding to 21244076 its reverse (67044212), we get a palindrome (88288288).

The spelling of 21244076 in words is "twenty-one million, two hundred forty-four thousand, seventy-six".