21106067 has 2 divisors, whose sum is σ = 21106068. Its totient is φ = 21106066.

The previous prime is 21106051. The next prime is 21106079. The reversal of 21106067 is 76060112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21106067 - 2⁴ = 21106051 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21106037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553033 + 10553034.

It is an arithmetic number, because the mean of its divisors is an integer number (10553034).

Almost surely, 2^21106067 is an apocalyptic number.

21106067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106067 is an equidigital number, since it uses as much as digits as its factorization.

21106067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 21106067 is about 4594.1339771496. The cubic root of 21106067 is about 276.3561311528.

Adding to 21106067 its reverse (76060112), we get a palindrome (97166179).

The spelling of 21106067 in words is "twenty-one million, one hundred six thousand, sixty-seven".