21382349 has 2 divisors, whose sum is σ = 21382350. Its totient is φ = 21382348.

The previous prime is 21382331. The next prime is 21382369. The reversal of 21382349 is 94328312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 268324 = 4595^2 + 518^2 .

It is a cyclic number.

It is not a de Polignac number, because 21382349 - 2⁸ = 21382093 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21382369) 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, 10691174 + 10691175.

It is an arithmetic number, because the mean of its divisors is an integer number (10691175).

Almost surely, 2^21382349 is an apocalyptic number.

It is an amenable number.

21382349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21382349 is an equidigital number, since it uses as much as digits as its factorization.

21382349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 21382349 is about 4624.1052107408. The cubic root of 21382349 is about 277.5567570512.

The spelling of 21382349 in words is "twenty-one million, three hundred eighty-two thousand, three hundred forty-nine".