20121102102210 has 32 divisors (see below), whose sum is σ = 49595797616832. Its totient is φ = 5220610274880.

The previous prime is 20121102102149. The next prime is 20121102102289. The reversal of 20121102102210 is 1220120112102.

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 20121102102210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9063558396 + ... + 9063560615.

It is an arithmetic number, because the mean of its divisors is an integer number (1549868675526).

Almost surely, 2^{20121102102210} is an apocalyptic number.

20121102102210 is an abundant number, since it is smaller than the sum of its proper divisors (29474695514622).

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

20121102102210 is a wasteful number, since it uses less digits than its factorization.

20121102102210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18127119058.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20121102102210 its reverse (1220120112102), we get a palindrome (21341222214312).

The spelling of 20121102102210 in words is "twenty trillion, one hundred twenty-one billion, one hundred two million, one hundred two thousand, two hundred ten".