11247802121 has 2 divisors, whose sum is σ = 11247802122. Its totient is φ = 11247802120.

The previous prime is 11247802091. The next prime is 11247802127. The reversal of 11247802121 is 12120874211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7424234896 + 3823567225 = 86164^2 + 61835^2 .

It is an emirp because it is prime and its reverse (12120874211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11247802121 is a prime.

It is not a weakly prime, because it can be changed into another prime (11247802127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5623901060 + 5623901061.

It is an arithmetic number, because the mean of its divisors is an integer number (5623901061).

Almost surely, 2^11247802121 is an apocalyptic number.

It is an amenable number.

11247802121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11247802121 is an equidigital number, since it uses as much as digits as its factorization.

11247802121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 29.

The spelling of 11247802121 in words is "eleven billion, two hundred forty-seven million, eight hundred two thousand, one hundred twenty-one".