21112705253 has 2 divisors, whose sum is σ = 21112705254. Its totient is φ = 21112705252.

The previous prime is 21112705219. The next prime is 21112705283. The reversal of 21112705253 is 35250721112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21083620804 + 29084449 = 145202^2 + 5393^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112705253 - 2¹⁰ = 21112704229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112705283) 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, 10556352626 + 10556352627.

It is an arithmetic number, because the mean of its divisors is an integer number (10556352627).

Almost surely, 2^21112705253 is an apocalyptic number.

It is an amenable number.

21112705253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112705253 is an equidigital number, since it uses as much as digits as its factorization.

21112705253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 29.

The spelling of 21112705253 in words is "twenty-one billion, one hundred twelve million, seven hundred five thousand, two hundred fifty-three".