402503254321 has 12 divisors (see below), whose sum is σ = 480872615988. Its totient is φ = 335678388192.

The previous prime is 402503254313. The next prime is 402503254343. The reversal of 402503254321 is 123452305204.

It can be written as a sum of positive squares in 2 ways, for example, as 161854140721 + 240649113600 = 402311^2 + 490560^2 .

It is not a de Polignac number, because 402503254321 - 2³ = 402503254313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402503254121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111002946 + ... + 111006571.

It is an arithmetic number, because the mean of its divisors is an integer number (40072717999).

Almost surely, 2^402503254321 is an apocalyptic number.

It is an amenable number.

402503254321 is a deficient number, since it is larger than the sum of its proper divisors (78369361667).

402503254321 is a wasteful number, since it uses less digits than its factorization.

402503254321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222009568 (or 222009561 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 402503254321 its reverse (123452305204), we get a palindrome (525955559525).

The spelling of 402503254321 in words is "four hundred two billion, five hundred three million, two hundred fifty-four thousand, three hundred twenty-one".