21301253 has 2 divisors, whose sum is σ = 21301254. Its totient is φ = 21301252.

The previous prime is 21301229. The next prime is 21301277. The reversal of 21301253 is 35210312.

It is a balanced prime because it is at equal distance from previous prime (21301229) and next prime (21301277).

It can be written as a sum of positive squares in only one way, i.e., 17698849 + 3602404 = 4207^2 + 1898^2 .

It is a cyclic number.

It is not a de Polignac number, because 21301253 - 2⁸ = 21300997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21301853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650626 + 10650627.

It is an arithmetic number, because the mean of its divisors is an integer number (10650627).

Almost surely, 2^21301253 is an apocalyptic number.

It is an amenable number.

21301253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301253 is an equidigital number, since it uses as much as digits as its factorization.

21301253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21301253 is about 4615.3280490123. The cubic root of 21301253 is about 277.2054196173.

Adding to 21301253 its reverse (35210312), we get a palindrome (56511565).

The spelling of 21301253 in words is "twenty-one million, three hundred one thousand, two hundred fifty-three".