21440076 has 24 divisors (see below), whose sum is σ = 57173760. Its totient is φ = 6125712.

The previous prime is 21440059. The next prime is 21440087. The reversal of 21440076 is 67004412.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 127536 + ... + 127703.

It is an arithmetic number, because the mean of its divisors is an integer number (2382240).

Almost surely, 2^21440076 is an apocalyptic number.

It is an amenable number.

21440076 is an abundant number, since it is smaller than the sum of its proper divisors (35733684).

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

21440076 is a wasteful number, since it uses less digits than its factorization.

21440076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255253 (or 255251 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21440076 is about 4630.3429678589. The cubic root of 21440076 is about 277.8063105743.

Adding to 21440076 its reverse (67004412), we get a palindrome (88444488).

The spelling of 21440076 in words is "twenty-one million, four hundred forty thousand, seventy-six".