21031000110312 has 256 divisors, whose sum is σ = 58588178688000. Its totient is φ = 6261156937728.

The previous prime is 21031000110301. The next prime is 21031000110349. The reversal of 21031000110312 is 21301100013012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21031000110291 and 21031000110300.

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 63 ways as a sum of consecutive naturals, for example, 212091208 + ... + 212190344.

It is an arithmetic number, because the mean of its divisors is an integer number (228860073000).

Almost surely, 2^{21031000110312} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21031000110312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29294089344000).

21031000110312 is an abundant number, since it is smaller than the sum of its proper divisors (37557178577688).

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

21031000110312 is a wasteful number, since it uses less digits than its factorization.

21031000110312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99480 (or 99476 counting only the distinct ones).

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

Adding to 21031000110312 its reverse (21301100013012), we get a palindrome (42332100123324).

The spelling of 21031000110312 in words is "twenty-one trillion, thirty-one billion, one hundred ten thousand, three hundred twelve".