20121312004 has 24 divisors (see below), whose sum is σ = 35555640120. Its totient is φ = 9962717184.

The previous prime is 20121311989. The next prime is 20121312017. The reversal of 20121312004 is 40021312102.

It can be written as a sum of positive squares in 4 ways, for example, as 240312004 + 19881000000 = 15502^2 + 141000^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 501852 + ... + 540460.

It is an arithmetic number, because the mean of its divisors is an integer number (1481485005).

Almost surely, 2^20121312004 is an apocalyptic number.

It is an amenable number.

20121312004 is a deficient number, since it is larger than the sum of its proper divisors (15434328116).

20121312004 is a wasteful number, since it uses less digits than its factorization.

20121312004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39879 (or 39877 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20121312004 its reverse (40021312102), we get a palindrome (60142624106).

The spelling of 20121312004 in words is "twenty billion, one hundred twenty-one million, three hundred twelve thousand, four".