20121031210110 has 128 divisors (see below), whose sum is σ = 49189656499200. Its totient is φ = 5266005488640.

The previous prime is 20121031210057. The next prime is 20121031210139. The reversal of 20121031210110 is 1101213012102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20121031210110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5424918936 + ... + 5424922644.

It is an arithmetic number, because the mean of its divisors is an integer number (384294191400).

Almost surely, 2^{20121031210110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121031210110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24594828249600).

20121031210110 is an abundant number, since it is smaller than the sum of its proper divisors (29068625289090).

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

20121031210110 is a wasteful number, since it uses less digits than its factorization.

20121031210110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7986.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 20121031210110 its reverse (1101213012102), we get a palindrome (21222244222212).

The spelling of 20121031210110 in words is "twenty trillion, one hundred twenty-one billion, thirty-one million, two hundred ten thousand, one hundred ten".