203031302121 has 12 divisors (see below), whose sum is σ = 293271457648. Its totient is φ = 135352345464.

The previous prime is 203031302101. The next prime is 203031302147. The reversal of 203031302121 is 121203130302.

203031302121 is a `hidden beast` number, since 20 + 303 + 130 + 212 + 1 = 666.

It is not a de Polignac number, because 203031302121 - 2²¹ = 203029204969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203031302094 and 203031302103.

It is not an unprimeable number, because it can be changed into a prime (203031302101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 964086 + ... + 1155648.

Almost surely, 2^203031302121 is an apocalyptic number.

It is an amenable number.

203031302121 is a deficient number, since it is larger than the sum of its proper divisors (90240155527).

203031302121 is a wasteful number, since it uses less digits than its factorization.

203031302121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309332 (or 309329 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 203031302121 its reverse (121203130302), we get a palindrome (324234432423).

The spelling of 203031302121 in words is "two hundred three billion, thirty-one million, three hundred two thousand, one hundred twenty-one".