405204341021 has 4 divisors (see below), whose sum is σ = 405206118492. Its totient is φ = 405202563552.

The previous prime is 405204340951. The next prime is 405204341027. The reversal of 405204341021 is 120143402504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 68427235396 + 336777105625 = 261586^2 + 580325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405204341021 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 (405204341027) 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 3 ways as a sum of consecutive naturals, for example, 485930 + ... + 1023003.

It is an arithmetic number, because the mean of its divisors is an integer number (101301529623).

Almost surely, 2^405204341021 is an apocalyptic number.

It is an amenable number.

405204341021 is a deficient number, since it is larger than the sum of its proper divisors (1777471).

405204341021 is a wasteful number, since it uses less digits than its factorization.

405204341021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777470.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 405204341021 its reverse (120143402504), we get a palindrome (525347743525).

The spelling of 405204341021 in words is "four hundred five billion, two hundred four million, three hundred forty-one thousand, twenty-one".