21714071 has 2 divisors, whose sum is σ = 21714072. Its totient is φ = 21714070.

The previous prime is 21714067. The next prime is 21714073. The reversal of 21714071 is 17041712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21714071 - 2² = 21714067 is a prime.

Together with 21714073, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21714073) 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, 10857035 + 10857036.

It is an arithmetic number, because the mean of its divisors is an integer number (10857036).

Almost surely, 2^21714071 is an apocalyptic number.

21714071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21714071 is an equidigital number, since it uses as much as digits as its factorization.

21714071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 21714071 is about 4659.8359413181. The cubic root of 21714071 is about 278.9847201543.

Adding to 21714071 its reverse (17041712), we get a palindrome (38755783).

The spelling of 21714071 in words is "twenty-one million, seven hundred fourteen thousand, seventy-one".