21221230012 has 12 divisors (see below), whose sum is σ = 37156825440. Its totient is φ = 10604994176.

The previous prime is 21221229907. The next prime is 21221230021. The reversal of 21221230012 is 21003212212.

It is a happy number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1396708 + ... + 1411819.

It is an arithmetic number, because the mean of its divisors is an integer number (3096402120).

Almost surely, 2^21221230012 is an apocalyptic number.

It is an amenable number.

21221230012 is a deficient number, since it is larger than the sum of its proper divisors (15935595428).

21221230012 is a wasteful number, since it uses less digits than its factorization.

21221230012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810420 (or 2810418 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21221230012 its reverse (21003212212), we get a palindrome (42224442224).

The spelling of 21221230012 in words is "twenty-one billion, two hundred twenty-one million, two hundred thirty thousand, twelve".