21106343 has 2 divisors, whose sum is σ = 21106344. Its totient is φ = 21106342.

The previous prime is 21106331. The next prime is 21106361. The reversal of 21106343 is 34360112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21106343 - 2⁸ = 21106087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21106303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553171 + 10553172.

It is an arithmetic number, because the mean of its divisors is an integer number (10553172).

Almost surely, 2^21106343 is an apocalyptic number.

21106343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106343 is an equidigital number, since it uses as much as digits as its factorization.

21106343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21106343 is about 4594.1640153569. The cubic root of 21106343 is about 276.3573357663.

Adding to 21106343 its reverse (34360112), we get a palindrome (55466455).

It can be divided in two parts, 211063 and 43, that multiplied together give a palindrome (9075709).

The spelling of 21106343 in words is "twenty-one million, one hundred six thousand, three hundred forty-three".