10404042421 has 4 divisors (see below), whose sum is σ = 10507052844. Its totient is φ = 10301032000.

The previous prime is 10404042419. The next prime is 10404042457. The reversal of 10404042421 is 12424040401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12424040401 = 101 ⋅123010301.

It can be written as a sum of positive squares in 2 ways, for example, as 5641662321 + 4762380100 = 75111^2 + 69010^2 .

It is a cyclic number.

It is not a de Polignac number, because 10404042421 - 2¹ = 10404042419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10404042392 and 10404042401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10404042461) 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, 51505060 + ... + 51505261.

It is an arithmetic number, because the mean of its divisors is an integer number (2626763211).

Almost surely, 2^10404042421 is an apocalyptic number.

It is an amenable number.

10404042421 is a deficient number, since it is larger than the sum of its proper divisors (103010423).

10404042421 is a wasteful number, since it uses less digits than its factorization.

10404042421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103010422.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 10404042421 its reverse (12424040401), we get a palindrome (22828082822).

The spelling of 10404042421 in words is "ten billion, four hundred four million, forty-two thousand, four hundred twenty-one".