405344055421 has 16 divisors (see below), whose sum is σ = 426209886720. Its totient is φ = 385029469440.

The previous prime is 405344055419. The next prime is 405344055443. The reversal of 405344055421 is 124550443504.

It is a cyclic number.

It is not a de Polignac number, because 405344055421 - 2¹ = 405344055419 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 (405344055481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158211 + ... + 914176.

It is an arithmetic number, because the mean of its divisors is an integer number (26638117920).

Almost surely, 2^405344055421 is an apocalyptic number.

It is an amenable number.

405344055421 is a deficient number, since it is larger than the sum of its proper divisors (20865831299).

405344055421 is a wasteful number, since it uses less digits than its factorization.

405344055421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072644.

The product of its (nonzero) digits is 192000, while the sum is 37.

Adding to 405344055421 its reverse (124550443504), we get a palindrome (529894498925).

The spelling of 405344055421 in words is "four hundred five billion, three hundred forty-four million, fifty-five thousand, four hundred twenty-one".