20121323231200 has 72 divisors (see below), whose sum is σ = 49953742833960. Its totient is φ = 7912113523200.

The previous prime is 20121323231167. The next prime is 20121323231227. The reversal of 20121323231200 is 213232312102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 213102411 + ... + 213196810.

It is an arithmetic number, because the mean of its divisors is an integer number (693801983805).

Almost surely, 2^{20121323231200} is an apocalyptic number.

20121323231200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121323231200 is an abundant number, since it is smaller than the sum of its proper divisors (29832419602760).

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

20121323231200 is a wasteful number, since it uses less digits than its factorization.

20121323231200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426299300 (or 426299287 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 20121323231200 its reverse (213232312102), we get a palindrome (20334555543302).

The spelling of 20121323231200 in words is "twenty trillion, one hundred twenty-one billion, three hundred twenty-three million, two hundred thirty-one thousand, two hundred".