203121023131 has 4 divisors (see below), whose sum is σ = 218745717232. Its totient is φ = 187496329032.

The previous prime is 203121023129. The next prime is 203121023153. The reversal of 203121023131 is 131320121302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 203121023131 - 2¹ = 203121023129 is a prime.

It is a super-2 number, since 2×203121023131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203121023099 and 203121023108.

It is not an unprimeable number, because it can be changed into a prime (203121020131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7812347031 + ... + 7812347056.

It is an arithmetic number, because the mean of its divisors is an integer number (54686429308).

Almost surely, 2^203121023131 is an apocalyptic number.

203121023131 is a deficient number, since it is larger than the sum of its proper divisors (15624694101).

203121023131 is a wasteful number, since it uses less digits than its factorization.

203121023131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15624694100.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 203121023131 its reverse (131320121302), we get a palindrome (334441144433).

The spelling of 203121023131 in words is "two hundred three billion, one hundred twenty-one million, twenty-three thousand, one hundred thirty-one".