405103123421 has 4 divisors (see below), whose sum is σ = 418170966144. Its totient is φ = 392035280700.

The previous prime is 405103123357. The next prime is 405103123433. The reversal of 405103123421 is 124321301504.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 405103123421 - 2⁶ = 405103123357 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 (405103123021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6533921315 + ... + 6533921376.

It is an arithmetic number, because the mean of its divisors is an integer number (104542741536).

Almost surely, 2^405103123421 is an apocalyptic number.

It is an amenable number.

405103123421 is a deficient number, since it is larger than the sum of its proper divisors (13067842723).

405103123421 is a wasteful number, since it uses less digits than its factorization.

405103123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13067842722.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 405103123421 its reverse (124321301504), we get a palindrome (529424424925).

The spelling of 405103123421 in words is "four hundred five billion, one hundred three million, one hundred twenty-three thousand, four hundred twenty-one".