11421563 has 4 divisors (see below), whose sum is σ = 11815440. Its totient is φ = 11027688.

The previous prime is 11421559. The next prime is 11421577. The reversal of 11421563 is 36512411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36512411 = 13 ⋅2808647.

It is a cyclic number.

It is not a de Polignac number, because 11421563 - 2² = 11421559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11421503) 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, 196895 + ... + 196952.

It is an arithmetic number, because the mean of its divisors is an integer number (2953860).

Almost surely, 2^11421563 is an apocalyptic number.

11421563 is a deficient number, since it is larger than the sum of its proper divisors (393877).

11421563 is an equidigital number, since it uses as much as digits as its factorization.

11421563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393876.

The product of its digits is 720, while the sum is 23.

The square root of 11421563 is about 3379.5802993863. The cubic root of 11421563 is about 225.2035228446.

Adding to 11421563 its reverse (36512411), we get a palindrome (47933974).

The spelling of 11421563 in words is "eleven million, four hundred twenty-one thousand, five hundred sixty-three".