11210009981 has 2 divisors, whose sum is σ = 11210009982. Its totient is φ = 11210009980.

The previous prime is 11210009977. The next prime is 11210010107. The reversal of 11210009981 is 18990001211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6976425625 + 4233584356 = 83525^2 + 65066^2 .

It is a cyclic number.

It is not a de Polignac number, because 11210009981 - 2² = 11210009977 is a prime.

It is a super-2 number, since 2×11210009981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11210009911) 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, 5605004990 + 5605004991.

It is an arithmetic number, because the mean of its divisors is an integer number (5605004991).

Almost surely, 2^11210009981 is an apocalyptic number.

It is an amenable number.

11210009981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11210009981 is an equidigital number, since it uses as much as digits as its factorization.

11210009981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 32.

The spelling of 11210009981 in words is "eleven billion, two hundred ten million, nine thousand, nine hundred eighty-one".