203121234020 has 48 divisors (see below), whose sum is σ = 436445997120. Its totient is φ = 79381316736.

The previous prime is 203121233993. The next prime is 203121234031. The reversal of 203121234020 is 20432121302.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 203121233983 and 203121234001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 335687 + ... + 720366.

It is an arithmetic number, because the mean of its divisors is an integer number (9092624940).

Almost surely, 2^203121234020 is an apocalyptic number.

203121234020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

203121234020 is an abundant number, since it is smaller than the sum of its proper divisors (233324763100).

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

203121234020 is a wasteful number, since it uses less digits than its factorization.

203121234020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056284 (or 1056282 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 203121234020 its reverse (20432121302), we get a palindrome (223553355322).

The spelling of 203121234020 in words is "two hundred three billion, one hundred twenty-one million, two hundred thirty-four thousand, twenty".