20121310121 has 8 divisors (see below), whose sum is σ = 21962852544. Its totient is φ = 18281823120.

The previous prime is 20121310117. The next prime is 20121310171. The reversal of 20121310121 is 12101312102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20121310121 - 2² = 20121310117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121310096 and 20121310105.

It is not an unprimeable number, because it can be changed into a prime (20121310171) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 493346 + ... + 532571.

It is an arithmetic number, because the mean of its divisors is an integer number (2745356568).

Almost surely, 2^20121310121 is an apocalyptic number.

It is an amenable number.

20121310121 is a deficient number, since it is larger than the sum of its proper divisors (1841542423).

20121310121 is a wasteful number, since it uses less digits than its factorization.

20121310121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027711.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20121310121 its reverse (12101312102), we get a palindrome (32222622223).

The spelling of 20121310121 in words is "twenty billion, one hundred twenty-one million, three hundred ten thousand, one hundred twenty-one".