20012312121 has 32 divisors (see below), whose sum is σ = 28283738112. Its totient is φ = 12560190720.

The previous prime is 20012312107. The next prime is 20012312149. The reversal of 20012312121 is 12121321002.

It is not a de Polignac number, because 20012312121 - 2⁷ = 20012311993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20012312121.

It is not an unprimeable number, because it can be changed into a prime (20012312321) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 3146881 + ... + 3153233.

It is an arithmetic number, because the mean of its divisors is an integer number (883866816).

Almost surely, 2^20012312121 is an apocalyptic number.

It is an amenable number.

20012312121 is a deficient number, since it is larger than the sum of its proper divisors (8271425991).

20012312121 is a wasteful number, since it uses less digits than its factorization.

20012312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7093.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20012312121 its reverse (12121321002), we get a palindrome (32133633123).

The spelling of 20012312121 in words is "twenty billion, twelve million, three hundred twelve thousand, one hundred twenty-one".