21145067 has 2 divisors, whose sum is σ = 21145068. Its totient is φ = 21145066.

The previous prime is 21145063. The next prime is 21145079. The reversal of 21145067 is 76054112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21145067 - 2² = 21145063 is a prime.

It is a super-2 number, since 2×21145067² = 894227716868978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21145063) 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, 10572533 + 10572534.

It is an arithmetic number, because the mean of its divisors is an integer number (10572534).

Almost surely, 2^21145067 is an apocalyptic number.

21145067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145067 is an equidigital number, since it uses as much as digits as its factorization.

21145067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 21145067 is about 4598.3765613529. The cubic root of 21145067 is about 276.5262442839.

Adding to 21145067 its reverse (76054112), we get a palindrome (97199179).

The spelling of 21145067 in words is "twenty-one million, one hundred forty-five thousand, sixty-seven".