20121002210220 has 48 divisors (see below), whose sum is σ = 56340636350208. Its totient is φ = 5365426288320.

The previous prime is 20121002210159. The next prime is 20121002210227. The reversal of 20121002210220 is 2201220012102.

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 20121002210220.

It is not an unprimeable number, because it can be changed into a prime (20121002210227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3579214 + ... + 7283733.

It is an arithmetic number, because the mean of its divisors is an integer number (1173763257296).

Almost surely, 2^{20121002210220} is an apocalyptic number.

20121002210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121002210220 is an abundant number, since it is smaller than the sum of its proper divisors (36219634139988).

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

20121002210220 is a wasteful number, since it uses less digits than its factorization.

20121002210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10893830 (or 10893828 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20121002210220 its reverse (2201220012102), we get a palindrome (22322222222322).

The spelling of 20121002210220 in words is "twenty trillion, one hundred twenty-one billion, two million, two hundred ten thousand, two hundred twenty".