21224132012 has 24 divisors (see below), whose sum is σ = 37395610896. Its totient is φ = 10539799488.

The previous prime is 21224132003. The next prime is 21224132029. The reversal of 21224132012 is 21023142212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674543 + ... + 705305.

It is an arithmetic number, because the mean of its divisors is an integer number (1558150454).

Almost surely, 2^21224132012 is an apocalyptic number.

It is an amenable number.

21224132012 is a deficient number, since it is larger than the sum of its proper divisors (16171478884).

21224132012 is a wasteful number, since it uses less digits than its factorization.

21224132012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31937 (or 31935 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21224132012 its reverse (21023142212), we get a palindrome (42247274224).

The spelling of 21224132012 in words is "twenty-one billion, two hundred twenty-four million, one hundred thirty-two thousand, twelve".