21227463 has 12 divisors (see below), whose sum is σ = 31410288. Its totient is φ = 13806240.

The previous prime is 21227461. The next prime is 21227477. The reversal of 21227463 is 36472212.

It is not a de Polignac number, because 21227463 - 2¹ = 21227461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28395 + ... + 29132.

It is an arithmetic number, because the mean of its divisors is an integer number (2617524).

Almost surely, 2^21227463 is an apocalyptic number.

21227463 is a deficient number, since it is larger than the sum of its proper divisors (10182825).

21227463 is a wasteful number, since it uses less digits than its factorization.

21227463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57574 (or 57571 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 21227463 is about 4607.3270993061. The cubic root of 21227463 is about 276.8849587669.

Adding to 21227463 its reverse (36472212), we get a palindrome (57699675).

The spelling of 21227463 in words is "twenty-one million, two hundred twenty-seven thousand, four hundred sixty-three".