203031540421 has 4 divisors (see below), whose sum is σ = 205601560000. Its totient is φ = 200461520844.

The previous prime is 203031540419. The next prime is 203031540443. The reversal of 203031540421 is 124045130302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 203031540421 - 2¹ = 203031540419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203031540401) 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, 1285009671 + ... + 1285009828.

It is an arithmetic number, because the mean of its divisors is an integer number (51400390000).

Almost surely, 2^203031540421 is an apocalyptic number.

It is an amenable number.

203031540421 is a deficient number, since it is larger than the sum of its proper divisors (2570019579).

203031540421 is an equidigital number, since it uses as much as digits as its factorization.

203031540421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2570019578.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 203031540421 its reverse (124045130302), we get a palindrome (327076670723).

The spelling of 203031540421 in words is "two hundred three billion, thirty-one million, five hundred forty thousand, four hundred twenty-one".