21080712 has 32 divisors (see below), whose sum is σ = 53200800. Its totient is φ = 6960384.

The previous prime is 21080711. The next prime is 21080743. The reversal of 21080712 is 21708012.

It is not an unprimeable number, because it can be changed into a prime (21080711) 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, 1537 + ... + 6672.

It is an arithmetic number, because the mean of its divisors is an integer number (1662525).

Almost surely, 2^21080712 is an apocalyptic number.

It is an amenable number.

21080712 is an abundant number, since it is smaller than the sum of its proper divisors (32120088).

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

21080712 is a wasteful number, since it uses less digits than its factorization.

21080712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8325 (or 8321 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 21080712 is about 4591.3736506627. The cubic root of 21080712 is about 276.2454233731.

Adding to 21080712 its reverse (21708012), we get a palindrome (42788724).

The spelling of 21080712 in words is "twenty-one million, eighty thousand, seven hundred twelve".