11421405 has 20 divisors (see below), whose sum is σ = 20474652. Its totient is φ = 6091200.

The previous prime is 11421401. The next prime is 11421437. The reversal of 11421405 is 50412411.

It can be written as a sum of positive squares in 2 ways, for example, as 5861241 + 5560164 = 2421^2 + 2358^2 .

It is not a de Polignac number, because 11421405 - 2² = 11421401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11421401) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13696 + ... + 14505.

Almost surely, 2^11421405 is an apocalyptic number.

11421405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11421405 is a deficient number, since it is larger than the sum of its proper divisors (9053247).

11421405 is an equidigital number, since it uses as much as digits as its factorization.

11421405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28218 (or 28209 counting only the distinct ones).

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

The square root of 11421405 is about 3379.5569236218. The cubic root of 11421405 is about 225.2024843901.

Adding to 11421405 its reverse (50412411), we get a palindrome (61833816).

The spelling of 11421405 in words is "eleven million, four hundred twenty-one thousand, four hundred five".