20121023210305 has 16 divisors (see below), whose sum is σ = 25956795905280. Its totient is φ = 14925157638912.

The previous prime is 20121023210263. The next prime is 20121023210311. The reversal of 20121023210305 is 50301232012102.

It is a cyclic number.

It is not a de Polignac number, because 20121023210305 - 2¹³ = 20121023202113 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2253189624 + ... + 2253198553.

It is an arithmetic number, because the mean of its divisors is an integer number (1622299744080).

Almost surely, 2^{20121023210305} is an apocalyptic number.

It is an amenable number.

20121023210305 is a deficient number, since it is larger than the sum of its proper divisors (5835772694975).

20121023210305 is a wasteful number, since it uses less digits than its factorization.

20121023210305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4506388248.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 20121023210305 its reverse (50301232012102), we get a palindrome (70422255222407).

The spelling of 20121023210305 in words is "twenty trillion, one hundred twenty-one billion, twenty-three million, two hundred ten thousand, three hundred five".