20121331103202 has 128 divisors (see below), whose sum is σ = 47444126920704. Its totient is φ = 5568816123648.

The previous prime is 20121331103189. The next prime is 20121331103267. The reversal of 20121331103202 is 20230113312102.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 352093843 + ... + 352150985.

It is an arithmetic number, because the mean of its divisors is an integer number (370657241568).

Almost surely, 2^{20121331103202} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121331103202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23722063460352).

20121331103202 is an abundant number, since it is smaller than the sum of its proper divisors (27322795817502).

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

20121331103202 is a wasteful number, since it uses less digits than its factorization.

20121331103202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58192.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 20121331103202 its reverse (20230113312102), we get a palindrome (40351444415304).

The spelling of 20121331103202 in words is "twenty trillion, one hundred twenty-one billion, three hundred thirty-one million, one hundred three thousand, two hundred two".