21325349 has 2 divisors, whose sum is σ = 21325350. Its totient is φ = 21325348.

The previous prime is 21325331. The next prime is 21325387. The reversal of 21325349 is 94352312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20994724 + 330625 = 4582^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 21325349 - 2⁸ = 21325093 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 (21325319) 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, 10662674 + 10662675.

It is an arithmetic number, because the mean of its divisors is an integer number (10662675).

Almost surely, 2^21325349 is an apocalyptic number.

It is an amenable number.

21325349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21325349 is an equidigital number, since it uses as much as digits as its factorization.

21325349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 21325349 is about 4617.9377431923. The cubic root of 21325349 is about 277.3099052507.

The spelling of 21325349 in words is "twenty-one million, three hundred twenty-five thousand, three hundred forty-nine".