20121323404 has 48 divisors (see below), whose sum is σ = 45222524928. Its totient is φ = 7613990208.

The previous prime is 20121323333. The next prime is 20121323407. The reversal of 20121323404 is 40432312102.

It is not an unprimeable number, because it can be changed into a prime (20121323407) 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 15 ways as a sum of consecutive naturals, for example, 1193332 + ... + 1210075.

It is an arithmetic number, because the mean of its divisors is an integer number (942135936).

Almost surely, 2^20121323404 is an apocalyptic number.

It is an amenable number.

20121323404 is an abundant number, since it is smaller than the sum of its proper divisors (25101201524).

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

20121323404 is a wasteful number, since it uses less digits than its factorization.

20121323404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403454 (or 2403452 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20121323404 its reverse (40432312102), we get a palindrome (60553635506).

The spelling of 20121323404 in words is "twenty billion, one hundred twenty-one million, three hundred twenty-three thousand, four hundred four".