21126067 has 4 divisors (see below), whose sum is σ = 21138120. Its totient is φ = 21114016.

The previous prime is 21126059. The next prime is 21126089. The reversal of 21126067 is 76062112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21126067 - 2³ = 21126059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21126467) 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 in 3 ways as a sum of consecutive naturals, for example, 2833 + ... + 7090.

It is an arithmetic number, because the mean of its divisors is an integer number (5284530).

Almost surely, 2^21126067 is an apocalyptic number.

21126067 is a deficient number, since it is larger than the sum of its proper divisors (12053).

21126067 is an equidigital number, since it uses as much as digits as its factorization.

21126067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12052.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21126067 is about 4596.3101505447. The cubic root of 21126067 is about 276.4433948089.

Adding to 21126067 its reverse (76062112), we get a palindrome (97188179).

The spelling of 21126067 in words is "twenty-one million, one hundred twenty-six thousand, sixty-seven".