21227467 has 4 divisors (see below), whose sum is σ = 21912256. Its totient is φ = 20542680.

The previous prime is 21227461. The next prime is 21227477. The reversal of 21227467 is 76472212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21227467 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 684757 = 21227467 / (2 + 1 + 2 + 2 + 7 + 4 + 6 + 7).

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 342348 + ... + 342409.

It is an arithmetic number, because the mean of its divisors is an integer number (5478064).

Almost surely, 2^21227467 is an apocalyptic number.

21227467 is a deficient number, since it is larger than the sum of its proper divisors (684789).

21227467 is an equidigital number, since it uses as much as digits as its factorization.

21227467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684788.

The product of its digits is 9408, while the sum is 31.

The square root of 21227467 is about 4607.3275333972. The cubic root of 21227467 is about 276.8849761585.

Adding to 21227467 its reverse (76472212), we get a palindrome (97699679).

The spelling of 21227467 in words is "twenty-one million, two hundred twenty-seven thousand, four hundred sixty-seven".