40203431521 has 16 divisors (see below), whose sum is σ = 44075199168. Its totient is φ = 36368222400.

The previous prime is 40203431453. The next prime is 40203431533. The reversal of 40203431521 is 12513430204.

It is a cyclic number.

It is not a de Polignac number, because 40203431521 - 2³⁵ = 5843693153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40203431551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2060391 + ... + 2079811.

It is an arithmetic number, because the mean of its divisors is an integer number (2754699948).

Almost surely, 2^40203431521 is an apocalyptic number.

It is an amenable number.

40203431521 is a deficient number, since it is larger than the sum of its proper divisors (3871767647).

40203431521 is a wasteful number, since it uses less digits than its factorization.

40203431521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20352.

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

Adding to 40203431521 its reverse (12513430204), we get a palindrome (52716861725).

The spelling of 40203431521 in words is "forty billion, two hundred three million, four hundred thirty-one thousand, five hundred twenty-one".