20011213231200 has 180 divisors, whose sum is σ = 72977003821260. Its totient is φ = 5336323511040.

The previous prime is 20011213231199. The next prime is 20011213231277. The reversal of 20011213231200 is 213231211002.

20011213231200 is a `hidden beast` number, since 20 + 0 + 1 + 1 + 213 + 231 + 200 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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 29 ways as a sum of consecutive naturals, for example, 154342710 + ... + 154472309.

It is an arithmetic number, because the mean of its divisors is an integer number (405427799007).

Almost surely, 2^{20011213231200} is an apocalyptic number.

20011213231200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011213231200 is an abundant number, since it is smaller than the sum of its proper divisors (52965790590060).

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

20011213231200 is a wasteful number, since it uses less digits than its factorization.

20011213231200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308815051 (or 308815029 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20011213231200 its reverse (213231211002), we get a palindrome (20224444442202).

The spelling of 20011213231200 in words is "twenty trillion, eleven billion, two hundred thirteen million, two hundred thirty-one thousand, two hundred".