500121556220120 has 128 divisors (see below), whose sum is σ = 1216562867308800. Its totient is φ = 184389865744896.

The previous prime is 500121556220087. The next prime is 500121556220129. The reversal of 500121556220120 is 21022655121005.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (500121556220129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 693725687 + ... + 694446233.

It is an arithmetic number, because the mean of its divisors is an integer number (9504397400850).

Almost surely, 2^{500121556220120} 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 500121556220120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (608281433654400).

500121556220120 is an abundant number, since it is smaller than the sum of its proper divisors (716441311088680).

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

500121556220120 is a wasteful number, since it uses less digits than its factorization.

500121556220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745297 (or 745293 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 500121556220120 in words is "five hundred trillion, one hundred twenty-one billion, five hundred fifty-six million, two hundred twenty thousand, one hundred twenty".