21167143 has 2 divisors, whose sum is σ = 21167144. Its totient is φ = 21167142.

The previous prime is 21167123. The next prime is 21167147. The reversal of 21167143 is 34176112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21167143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21167147) 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, 10583571 + 10583572.

It is an arithmetic number, because the mean of its divisors is an integer number (10583572).

Almost surely, 2^21167143 is an apocalyptic number.

21167143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21167143 is an equidigital number, since it uses as much as digits as its factorization.

21167143 is an odious number, because the sum of its binary digits is odd.

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

The square root of 21167143 is about 4600.7763475309. The cubic root of 21167143 is about 276.6224443440.

The spelling of 21167143 in words is "twenty-one million, one hundred sixty-seven thousand, one hundred forty-three".