21011120353 has 2 divisors, whose sum is σ = 21011120354. Its totient is φ = 21011120352.

The previous prime is 21011120327. The next prime is 21011120357. The reversal of 21011120353 is 35302111012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18186410449 + 2824709904 = 134857^2 + 53148^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011120353 - 2¹⁷ = 21010989281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21011120353.

It is not a weakly prime, because it can be changed into another prime (21011120357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505560176 + 10505560177.

It is an arithmetic number, because the mean of its divisors is an integer number (10505560177).

Almost surely, 2^21011120353 is an apocalyptic number.

It is an amenable number.

21011120353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011120353 is an equidigital number, since it uses as much as digits as its factorization.

21011120353 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 19.

Adding to 21011120353 its reverse (35302111012), we get a palindrome (56313231365).

The spelling of 21011120353 in words is "twenty-one billion, eleven million, one hundred twenty thousand, three hundred fifty-three".