21134667 has 4 divisors (see below), whose sum is σ = 28179560. Its totient is φ = 14089776.

The previous prime is 21134657. The next prime is 21134713. The reversal of 21134667 is 76643112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21134667 - 2¹⁶ = 21069131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21134657) 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, 3522442 + ... + 3522447.

It is an arithmetic number, because the mean of its divisors is an integer number (7044890).

Almost surely, 2^21134667 is an apocalyptic number.

21134667 is a deficient number, since it is larger than the sum of its proper divisors (7044893).

21134667 is an equidigital number, since it uses as much as digits as its factorization.

21134667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7044892.

The product of its digits is 6048, while the sum is 30.

The square root of 21134667 is about 4597.2455883931. The cubic root of 21134667 is about 276.4809012485.

Adding to 21134667 its reverse (76643112), we get a palindrome (97777779).

The spelling of 21134667 in words is "twenty-one million, one hundred thirty-four thousand, six hundred sixty-seven".