21150067 has 2 divisors, whose sum is σ = 21150068. Its totient is φ = 21150066.

The previous prime is 21150061. The next prime is 21150079. The reversal of 21150067 is 76005112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21150067 - 2²³ = 12761459 is a prime.

It is not a weakly prime, because it can be changed into another prime (21150061) 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, 10575033 + 10575034.

It is an arithmetic number, because the mean of its divisors is an integer number (10575034).

Almost surely, 2^21150067 is an apocalyptic number.

21150067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150067 is an equidigital number, since it uses as much as digits as its factorization.

21150067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 21150067 is about 4598.9201993511. The cubic root of 21150067 is about 276.5480385280.

Adding to 21150067 its reverse (76005112), we get a palindrome (97155179).

The spelling of 21150067 in words is "twenty-one million, one hundred fifty thousand, sixty-seven".