405353421225421 has 8 divisors (see below), whose sum is σ = 435242778715584. Its totient is φ = 376135734690240.

The previous prime is 405353421225391. The next prime is 405353421225427. The reversal of 405353421225421 is 124522124353504.

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

It is a cyclic number.

It is not a de Polignac number, because 405353421225421 - 2³¹ = 405351273741773 is a prime.

It is a super-2 number, since 2×405353421225421² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405353421225427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167917737495 + ... + 167917739908.

It is an arithmetic number, because the mean of its divisors is an integer number (54405347339448).

Almost surely, 2^{405353421225421} is an apocalyptic number.

It is an amenable number.

405353421225421 is a deficient number, since it is larger than the sum of its proper divisors (29889357490163).

405353421225421 is a wasteful number, since it uses less digits than its factorization.

405353421225421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335835477491.

The product of its (nonzero) digits is 1152000, while the sum is 43.

Adding to 405353421225421 its reverse (124522124353504), we get a palindrome (529875545578925).

The spelling of 405353421225421 in words is "four hundred five trillion, three hundred fifty-three billion, four hundred twenty-one million, two hundred twenty-five thousand, four hundred twenty-one".