21255301 has 2 divisors, whose sum is σ = 21255302. Its totient is φ = 21255300.

The previous prime is 21255293. The next prime is 21255307. The reversal of 21255301 is 10355212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17056900 + 4198401 = 4130^2 + 2049^2 .

It is a cyclic number.

It is not a de Polignac number, because 21255301 - 2³ = 21255293 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 (21255307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627650 + 10627651.

It is an arithmetic number, because the mean of its divisors is an integer number (10627651).

Almost surely, 2^21255301 is an apocalyptic number.

It is an amenable number.

21255301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21255301 is an equidigital number, since it uses as much as digits as its factorization.

21255301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21255301 is about 4610.3471669713. The cubic root of 21255301 is about 277.0059428667.

The spelling of 21255301 in words is "twenty-one million, two hundred fifty-five thousand, three hundred one".