21841607 has 2 divisors, whose sum is σ = 21841608. Its totient is φ = 21841606.

The previous prime is 21841591. The next prime is 21841609. The reversal of 21841607 is 70614812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21841607 - 2⁴ = 21841591 is a prime.

Together with 21841609, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21841607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21841609) 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, 10920803 + 10920804.

It is an arithmetic number, because the mean of its divisors is an integer number (10920804).

Almost surely, 2^21841607 is an apocalyptic number.

21841607 is a deficient number, since it is larger than the sum of its proper divisors (1).

21841607 is an equidigital number, since it uses as much as digits as its factorization.

21841607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 21841607 is about 4673.5005081844. The cubic root of 21841607 is about 279.5298530266.

The spelling of 21841607 in words is "twenty-one million, eight hundred forty-one thousand, six hundred seven".