203121213020 has 96 divisors (see below), whose sum is σ = 478817982720. Its totient is φ = 71740892160.

The previous prime is 203121213017. The next prime is 203121213077. The reversal of 203121213020 is 20312121302.

It is a self number, because there is not a number n which added to its sum of digits gives 203121213020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1633364 + ... + 1753316.

It is an arithmetic number, because the mean of its divisors is an integer number (4987687320).

Almost surely, 2^203121213020 is an apocalyptic number.

203121213020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 203121213020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239408991360).

203121213020 is an abundant number, since it is smaller than the sum of its proper divisors (275696769700).

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

203121213020 is a wasteful number, since it uses less digits than its factorization.

203121213020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120195 (or 120193 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 203121213020 its reverse (20312121302), we get a palindrome (223433334322).

The spelling of 203121213020 in words is "two hundred three billion, one hundred twenty-one million, two hundred thirteen thousand, twenty".