21110352253 has 2 divisors, whose sum is σ = 21110352254. Its totient is φ = 21110352252.

The previous prime is 21110352229. The next prime is 21110352299. The reversal of 21110352253 is 35225301112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16146022489 + 4964329764 = 127067^2 + 70458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110352253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110352203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555176126 + 10555176127.

It is an arithmetic number, because the mean of its divisors is an integer number (10555176127).

Almost surely, 2^21110352253 is an apocalyptic number.

It is an amenable number.

21110352253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110352253 is an equidigital number, since it uses as much as digits as its factorization.

21110352253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 21110352253 its reverse (35225301112), we get a palindrome (56335653365).

The spelling of 21110352253 in words is "twenty-one billion, one hundred ten million, three hundred fifty-two thousand, two hundred fifty-three".