21111264716753 has 2 divisors, whose sum is σ = 21111264716754. Its totient is φ = 21111264716752.

The previous prime is 21111264716749. The next prime is 21111264716777. The reversal of 21111264716753 is 35761746211112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20076430532929 + 1034834183824 = 4480673^2 + 1017268^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111264716753 - 2² = 21111264716749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21111264716698 and 21111264716707.

It is not a weakly prime, because it can be changed into another prime (21111264716783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555632358376 + 10555632358377.

It is an arithmetic number, because the mean of its divisors is an integer number (10555632358377).

Almost surely, 2^{21111264716753} is an apocalyptic number.

It is an amenable number.

21111264716753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111264716753 is an equidigital number, since it uses as much as digits as its factorization.

21111264716753 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 47.

The spelling of 21111264716753 in words is "twenty-one trillion, one hundred eleven billion, two hundred sixty-four million, seven hundred sixteen thousand, seven hundred fifty-three".