21301339 has 2 divisors, whose sum is σ = 21301340. Its totient is φ = 21301338.

The previous prime is 21301331. The next prime is 21301361. The reversal of 21301339 is 93310312.

It is an a-pointer prime, because the next prime (21301361) can be obtained adding 21301339 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21301339 - 2³ = 21301331 is a prime.

It is not a weakly prime, because it can be changed into another prime (21301331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650669 + 10650670.

It is an arithmetic number, because the mean of its divisors is an integer number (10650670).

Almost surely, 2^21301339 is an apocalyptic number.

21301339 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301339 is an equidigital number, since it uses as much as digits as its factorization.

21301339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 21301339 is about 4615.3373657838. The cubic root of 21301339 is about 277.2057926725.

The spelling of 21301339 in words is "twenty-one million, three hundred one thousand, three hundred thirty-nine".