20121142305 has 16 divisors (see below), whose sum is σ = 35120539584. Its totient is φ = 9755705280.

The previous prime is 20121142303. The next prime is 20121142337. The reversal of 20121142305 is 50324112102.

It is not a de Polignac number, because 20121142305 - 2¹ = 20121142303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121142303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60972994 + ... + 60973323.

It is an arithmetic number, because the mean of its divisors is an integer number (2195033724).

Almost surely, 2^20121142305 is an apocalyptic number.

It is an amenable number.

20121142305 is a deficient number, since it is larger than the sum of its proper divisors (14999397279).

20121142305 is a wasteful number, since it uses less digits than its factorization.

20121142305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121946336.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 20121142305 its reverse (50324112102), we get a palindrome (70445254407).

The spelling of 20121142305 in words is "twenty billion, one hundred twenty-one million, one hundred forty-two thousand, three hundred five".