20121231004 has 24 divisors (see below), whose sum is σ = 41001756768. Its totient is φ = 8460678720.

The previous prime is 20121230981. The next prime is 20121231023. The reversal of 20121231004 is 40013212102.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 6777907 + ... + 6780874.

It is an arithmetic number, because the mean of its divisors is an integer number (1708406532).

Almost surely, 2^20121231004 is an apocalyptic number.

It is an amenable number.

20121231004 is an abundant number, since it is smaller than the sum of its proper divisors (20880525764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20121231004 is a wasteful number, since it uses less digits than its factorization.

20121231004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13558845 (or 13558843 counting only the distinct ones).

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

Adding to 20121231004 its reverse (40013212102), we get a palindrome (60134443106).

The spelling of 20121231004 in words is "twenty billion, one hundred twenty-one million, two hundred thirty-one thousand, four".