21011224313 has 2 divisors, whose sum is σ = 21011224314. Its totient is φ = 21011224312.

The previous prime is 21011224279. The next prime is 21011224319. The reversal of 21011224313 is 31342211012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20634747904 + 376476409 = 143648^2 + 19403^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011224313 - 2⁸ = 21011224057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21011224319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505612156 + 10505612157.

It is an arithmetic number, because the mean of its divisors is an integer number (10505612157).

Almost surely, 2^21011224313 is an apocalyptic number.

It is an amenable number.

21011224313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011224313 is an equidigital number, since it uses as much as digits as its factorization.

21011224313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21011224313 its reverse (31342211012), we get a palindrome (52353435325).

The spelling of 21011224313 in words is "twenty-one billion, eleven million, two hundred twenty-four thousand, three hundred thirteen".