21031211231200 has 72 divisors (see below), whose sum is σ = 51348254626368. Its totient is φ = 8411532487680.

The previous prime is 21031211231183. The next prime is 21031211231227. The reversal of 21031211231200 is 213211213012.

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, 5607324 + ... + 8573476.

It is an arithmetic number, because the mean of its divisors is an integer number (713170203144).

Almost surely, 2^{21031211231200} is an apocalyptic number.

21031211231200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031211231200 is an abundant number, since it is smaller than the sum of its proper divisors (30317043395168).

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

21031211231200 is a wasteful number, since it uses less digits than its factorization.

21031211231200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2975036 (or 2975023 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21031211231200 its reverse (213211213012), we get a palindrome (21244422444212).

The spelling of 21031211231200 in words is "twenty-one trillion, thirty-one billion, two hundred eleven million, two hundred thirty-one thousand, two hundred".