21131231124312 has 24 divisors (see below), whose sum is σ = 57230417628540. Its totient is φ = 7043743708080.

The previous prime is 21131231124271. The next prime is 21131231124347. The reversal of 21131231124312 is 21342113213112.

21131231124312 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 12 + 311 + 24 + 312 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 146744660514 + ... + 146744660657.

Almost surely, 2^{21131231124312} is an apocalyptic number.

It is an amenable number.

21131231124312 is an abundant number, since it is smaller than the sum of its proper divisors (36099186504228).

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

21131231124312 is a wasteful number, since it uses less digits than its factorization.

21131231124312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293489321183 (or 293489321176 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

Adding to 21131231124312 its reverse (21342113213112), we get a palindrome (42473344337424).

The spelling of 21131231124312 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred thirty-one million, one hundred twenty-four thousand, three hundred twelve".