405124352421 has 4 divisors (see below), whose sum is σ = 540165803232. Its totient is φ = 270082901612.

The previous prime is 405124352411. The next prime is 405124352449. The reversal of 405124352421 is 124253421504.

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 405124352421 - 2⁵ = 405124352389 is a prime.

It is a super-2 number, since 2×405124352421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405124352411) 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, 67520725401 + ... + 67520725406.

It is an arithmetic number, because the mean of its divisors is an integer number (135041450808).

Almost surely, 2^405124352421 is an apocalyptic number.

It is an amenable number.

405124352421 is a deficient number, since it is larger than the sum of its proper divisors (135041450811).

405124352421 is a wasteful number, since it uses less digits than its factorization.

405124352421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135041450810.

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 405124352421 its reverse (124253421504), we get a palindrome (529377773925).

The spelling of 405124352421 in words is "four hundred five billion, one hundred twenty-four million, three hundred fifty-two thousand, four hundred twenty-one".