21227023 has 2 divisors, whose sum is σ = 21227024. Its totient is φ = 21227022.

The previous prime is 21226969. The next prime is 21227081. The reversal of 21227023 is 32072212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21227023 - 2⁹ = 21226511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613511 + 10613512.

It is an arithmetic number, because the mean of its divisors is an integer number (10613512).

Almost surely, 2^21227023 is an apocalyptic number.

21227023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21227023 is an equidigital number, since it uses as much as digits as its factorization.

21227023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 21227023 is about 4607.2793490302. The cubic root of 21227023 is about 276.8830456756.

Adding to 21227023 its reverse (32072212), we get a palindrome (53299235).

The spelling of 21227023 in words is "twenty-one million, two hundred twenty-seven thousand, twenty-three".