11405421 has 16 divisors (see below), whose sum is σ = 17310720. Its totient is φ = 7417440.

The previous prime is 11405411. The next prime is 11405423. The reversal of 11405421 is 12450411.

It is not a de Polignac number, because 11405421 - 2⁵ = 11405389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11405394 and 11405403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11405423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4045 + ... + 6258.

It is an arithmetic number, because the mean of its divisors is an integer number (1081920).

Almost surely, 2^11405421 is an apocalyptic number.

It is an amenable number.

11405421 is a deficient number, since it is larger than the sum of its proper divisors (5905299).

11405421 is a wasteful number, since it uses less digits than its factorization.

11405421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10353 (or 10347 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 11405421 is about 3377.1912886302. The cubic root of 11405421 is about 225.0973800700.

Adding to 11405421 its reverse (12450411), we get a palindrome (23855832).

It can be divided in two parts, 1140 and 5421, that added together give a 8-th power (6561 = 3⁸).

The spelling of 11405421 in words is "eleven million, four hundred five thousand, four hundred twenty-one".