21303707 has 2 divisors, whose sum is σ = 21303708. Its totient is φ = 21303706.

The previous prime is 21303697. The next prime is 21303713. The reversal of 21303707 is 70730312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21303707 - 2⁴ = 21303691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21303757) 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, 10651853 + 10651854.

It is an arithmetic number, because the mean of its divisors is an integer number (10651854).

Almost surely, 2^21303707 is an apocalyptic number.

21303707 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303707 is an equidigital number, since it uses as much as digits as its factorization.

21303707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 882, while the sum is 23.

The square root of 21303707 is about 4615.5938946142. The cubic root of 21303707 is about 277.2160643116.

The spelling of 21303707 in words is "twenty-one million, three hundred three thousand, seven hundred seven".