21031100031012 has 24 divisors (see below), whose sum is σ = 51959188312416. Its totient is φ = 6597992166528.

The previous prime is 21031100030987. The next prime is 21031100031023. The reversal of 21031100031012 is 21013000113012.

It is a happy number.

21031100031012 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 21031100030982 and 21031100031000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51546813598 + ... + 51546814005.

It is an arithmetic number, because the mean of its divisors is an integer number (2164966179684).

Almost surely, 2^{21031100031012} is an apocalyptic number.

It is an amenable number.

21031100031012 is an abundant number, since it is smaller than the sum of its proper divisors (30928088281404).

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

21031100031012 is a wasteful number, since it uses less digits than its factorization.

21031100031012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103093627627 (or 103093627625 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21031100031012 its reverse (21013000113012), we get a palindrome (42044100144024).

The spelling of 21031100031012 in words is "twenty-one trillion, thirty-one billion, one hundred million, thirty-one thousand, twelve".