21760012 has 24 divisors (see below), whose sum is σ = 39231360. Its totient is φ = 10554240.

The previous prime is 21760003. The next prime is 21760019. The reversal of 21760012 is 21006712.

It is not an unprimeable number, because it can be changed into a prime (21760019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45189 + ... + 45667.

It is an arithmetic number, because the mean of its divisors is an integer number (1634640).

Almost surely, 2^21760012 is an apocalyptic number.

It is an amenable number.

21760012 is a deficient number, since it is larger than the sum of its proper divisors (17471348).

21760012 is a wasteful number, since it uses less digits than its factorization.

21760012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 21760012 is about 4664.7628021155. The cubic root of 21760012 is about 279.1813331964.

Adding to 21760012 its reverse (21006712), we get a palindrome (42766724).

The spelling of 21760012 in words is "twenty-one million, seven hundred sixty thousand, twelve".