21423067 has 2 divisors, whose sum is σ = 21423068. Its totient is φ = 21423066.

The previous prime is 21423053. The next prime is 21423079. The reversal of 21423067 is 76032412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21423067 - 2⁷ = 21422939 is a prime.

It is not a weakly prime, because it can be changed into another prime (21423007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711533 + 10711534.

It is an arithmetic number, because the mean of its divisors is an integer number (10711534).

Almost surely, 2^21423067 is an apocalyptic number.

21423067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423067 is an equidigital number, since it uses as much as digits as its factorization.

21423067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21423067 is about 4628.5059144393. The cubic root of 21423067 is about 277.7328273516.

Adding to 21423067 its reverse (76032412), we get a palindrome (97455479).

The spelling of 21423067 in words is "twenty-one million, four hundred twenty-three thousand, sixty-seven".