21112311053 has 2 divisors, whose sum is σ = 21112311054. Its totient is φ = 21112311052.

The previous prime is 21112311013. The next prime is 21112311071. The reversal of 21112311053 is 35011321112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19745308324 + 1367002729 = 140518^2 + 36973^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112311053 - 2²⁸ = 20843875597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112311013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556155526 + 10556155527.

It is an arithmetic number, because the mean of its divisors is an integer number (10556155527).

Almost surely, 2^21112311053 is an apocalyptic number.

It is an amenable number.

21112311053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112311053 is an equidigital number, since it uses as much as digits as its factorization.

21112311053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 21112311053 its reverse (35011321112), we get a palindrome (56123632165).

The spelling of 21112311053 in words is "twenty-one billion, one hundred twelve million, three hundred eleven thousand, fifty-three".