21103121230012 has 12 divisors (see below), whose sum is σ = 36930605627160. Its totient is φ = 10551519622256.

The previous prime is 21103121229907. The next prime is 21103121230031. The reversal of 21103121230012 is 21003212130112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9074962 + ... + 11160697.

It is an arithmetic number, because the mean of its divisors is an integer number (3077550468930).

Almost surely, 2^{21103121230012} is an apocalyptic number.

It is an amenable number.

21103121230012 is a deficient number, since it is larger than the sum of its proper divisors (15827484397148).

21103121230012 is a wasteful number, since it uses less digits than its factorization.

21103121230012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20496380 (or 20496378 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21103121230012 its reverse (21003212130112), we get a palindrome (42106333360124).

The spelling of 21103121230012 in words is "twenty-one trillion, one hundred three billion, one hundred twenty-one million, two hundred thirty thousand, twelve".