21342071 has 2 divisors, whose sum is σ = 21342072. Its totient is φ = 21342070.

The previous prime is 21342059. The next prime is 21342119. The reversal of 21342071 is 17024312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21342071 - 2¹⁴ = 21325687 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21342001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671035 + 10671036.

It is an arithmetic number, because the mean of its divisors is an integer number (10671036).

Almost surely, 2^21342071 is an apocalyptic number.

21342071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342071 is an equidigital number, since it uses as much as digits as its factorization.

21342071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21342071 is about 4619.7479368468. The cubic root of 21342071 is about 277.3823693200.

Adding to 21342071 its reverse (17024312), we get a palindrome (38366383).

The spelling of 21342071 in words is "twenty-one million, three hundred forty-two thousand, seventy-one".