21269359 has 2 divisors, whose sum is σ = 21269360. Its totient is φ = 21269358.

The previous prime is 21269357. The next prime is 21269401. The reversal of 21269359 is 95396212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21269359 - 2¹ = 21269357 is a prime.

Together with 21269357, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1345888 and since 21269359 and 1345888 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21269357) 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, 10634679 + 10634680.

It is an arithmetic number, because the mean of its divisors is an integer number (10634680).

Almost surely, 2^21269359 is an apocalyptic number.

21269359 is a deficient number, since it is larger than the sum of its proper divisors (1).

21269359 is an equidigital number, since it uses as much as digits as its factorization.

21269359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 37.

The square root of 21269359 is about 4611.8715289999. The cubic root of 21269359 is about 277.0669988725.

The spelling of 21269359 in words is "twenty-one million, two hundred sixty-nine thousand, three hundred fifty-nine".