21114055813 has 2 divisors, whose sum is σ = 21114055814. Its totient is φ = 21114055812.

The previous prime is 21114055769. The next prime is 21114055819. The reversal of 21114055813 is 31855041112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20944457284 + 169598529 = 144722^2 + 13023^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21114055813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21114055819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557027906 + 10557027907.

It is an arithmetic number, because the mean of its divisors is an integer number (10557027907).

Almost surely, 2^21114055813 is an apocalyptic number.

It is an amenable number.

21114055813 is a deficient number, since it is larger than the sum of its proper divisors (1).

21114055813 is an equidigital number, since it uses as much as digits as its factorization.

21114055813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 31.

Adding to 21114055813 its reverse (31855041112), we get a palindrome (52969096925).

The spelling of 21114055813 in words is "twenty-one billion, one hundred fourteen million, fifty-five thousand, eight hundred thirteen".