21463361 has 4 divisors (see below), whose sum is σ = 21479424. Its totient is φ = 21447300.

The previous prime is 21463339. The next prime is 21463363. The reversal of 21463361 is 16336412.

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 a de Polignac number, because none of the positive numbers 2^k-21463361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21463361.

It is not an unprimeable number, because it can be changed into a prime (21463363) 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, 5825 + ... + 8766.

It is an arithmetic number, because the mean of its divisors is an integer number (5369856).

Almost surely, 2^21463361 is an apocalyptic number.

It is an amenable number.

21463361 is a deficient number, since it is larger than the sum of its proper divisors (16063).

21463361 is a wasteful number, since it uses less digits than its factorization.

21463361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16062.

The product of its digits is 2592, while the sum is 26.

The square root of 21463361 is about 4632.8566781199. The cubic root of 21463361 is about 277.9068447261.

Adding to 21463361 its reverse (16336412), we get a palindrome (37799773).

The spelling of 21463361 in words is "twenty-one million, four hundred sixty-three thousand, three hundred sixty-one".