21385367 has 2 divisors, whose sum is σ = 21385368. Its totient is φ = 21385366.

The previous prime is 21385349. The next prime is 21385373. The reversal of 21385367 is 76358312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21385367 - 2²⁴ = 4608151 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 (21385307) 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, 10692683 + 10692684.

It is an arithmetic number, because the mean of its divisors is an integer number (10692684).

Almost surely, 2^21385367 is an apocalyptic number.

21385367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21385367 is an equidigital number, since it uses as much as digits as its factorization.

21385367 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 21385367 is about 4624.4315326319. The cubic root of 21385367 is about 277.5698149693.

The spelling of 21385367 in words is "twenty-one million, three hundred eighty-five thousand, three hundred sixty-seven".