21329167 has 2 divisors, whose sum is σ = 21329168. Its totient is φ = 21329166.

The previous prime is 21329159. The next prime is 21329177. The reversal of 21329167 is 76192312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21329167 - 2³ = 21329159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21329107) 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, 10664583 + 10664584.

It is an arithmetic number, because the mean of its divisors is an integer number (10664584).

Almost surely, 2^21329167 is an apocalyptic number.

21329167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21329167 is an equidigital number, since it uses as much as digits as its factorization.

21329167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 21329167 is about 4618.3511126808. The cubic root of 21329167 is about 277.3264537261.

The spelling of 21329167 in words is "twenty-one million, three hundred twenty-nine thousand, one hundred sixty-seven".