405345405021 has 8 divisors (see below), whose sum is σ = 541074006144. Its totient is φ = 269923536960.

The previous prime is 405345405019. The next prime is 405345405043. The reversal of 405345405021 is 120504543504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 405345405021 - 2¹ = 405345405019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405345405121) 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 7 ways as a sum of consecutive naturals, for example, 76680181 + ... + 76685466.

It is an arithmetic number, because the mean of its divisors is an integer number (67634250768).

Almost surely, 2^405345405021 is an apocalyptic number.

It is an amenable number.

405345405021 is a deficient number, since it is larger than the sum of its proper divisors (135728601123).

405345405021 is a wasteful number, since it uses less digits than its factorization.

405345405021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153366531.

The product of its (nonzero) digits is 48000, while the sum is 33.

Adding to 405345405021 its reverse (120504543504), we get a palindrome (525849948525).

The spelling of 405345405021 in words is "four hundred five billion, three hundred forty-five million, four hundred five thousand, twenty-one".