10211009981 has 2 divisors, whose sum is σ = 10211009982. Its totient is φ = 10211009980.

The previous prime is 10211009953. The next prime is 10211009983. The reversal of 10211009981 is 18990011201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9589305625 + 621704356 = 97925^2 + 24934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10211009981 is a prime.

It is a super-2 number, since 2×10211009981² (a number of 21 digits) contains 22 as substring.

Together with 10211009983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10211009983) 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, 5105504990 + 5105504991.

It is an arithmetic number, because the mean of its divisors is an integer number (5105504991).

Almost surely, 2^10211009981 is an apocalyptic number.

It is an amenable number.

10211009981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10211009981 is an equidigital number, since it uses as much as digits as its factorization.

10211009981 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 10211009981 in words is "ten billion, two hundred eleven million, nine thousand, nine hundred eighty-one".