203121304102100 has 36 divisors (see below), whose sum is σ = 440903290604700. Its totient is φ = 81224547317760.

The previous prime is 203121304102043. The next prime is 203121304102139. The reversal of 203121304102100 is 1201403121302.

It can be written as a sum of positive squares in 6 ways, for example, as 88329028804 + 203032975073296 = 297202^2 + 14248964^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 299338445 + ... + 300016244.

Almost surely, 2^{203121304102100} is an apocalyptic number.

203121304102100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

203121304102100 is an abundant number, since it is smaller than the sum of its proper divisors (237781986502600).

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

203121304102100 is a wasteful number, since it uses less digits than its factorization.

203121304102100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599358092 (or 599358085 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 203121304102100 its reverse (1201403121302), we get a palindrome (204322707223402).

The spelling of 203121304102100 in words is "two hundred three trillion, one hundred twenty-one billion, three hundred four million, one hundred two thousand, one hundred".