21382307 has 2 divisors, whose sum is σ = 21382308. Its totient is φ = 21382306.

The previous prime is 21382303. The next prime is 21382327. The reversal of 21382307 is 70328312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21382307 - 2² = 21382303 is a prime.

It is not a weakly prime, because it can be changed into another prime (21382303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10691153 + 10691154.

It is an arithmetic number, because the mean of its divisors is an integer number (10691154).

Almost surely, 2^21382307 is an apocalyptic number.

21382307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21382307 is an equidigital number, since it uses as much as digits as its factorization.

21382307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 21382307 is about 4624.1006693194. The cubic root of 21382307 is about 277.5565753220.

The spelling of 21382307 in words is "twenty-one million, three hundred eighty-two thousand, three hundred seven".