21253423271 has 2 divisors, whose sum is σ = 21253423272. Its totient is φ = 21253423270.

The previous prime is 21253423253. The next prime is 21253423283. The reversal of 21253423271 is 17232435212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21253423271 - 2³⁴ = 4073554087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21253423201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626711635 + 10626711636.

It is an arithmetic number, because the mean of its divisors is an integer number (10626711636).

Almost surely, 2^21253423271 is an apocalyptic number.

21253423271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21253423271 is an equidigital number, since it uses as much as digits as its factorization.

21253423271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 32.

Adding to 21253423271 its reverse (17232435212), we get a palindrome (38485858483).

The spelling of 21253423271 in words is "twenty-one billion, two hundred fifty-three million, four hundred twenty-three thousand, two hundred seventy-one".