10212009961 has 2 divisors, whose sum is σ = 10212009962. Its totient is φ = 10212009960.

The previous prime is 10212009947. The next prime is 10212009979. The reversal of 10212009961 is 16990021201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6263772736 + 3948237225 = 79144^2 + 62835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10212009961 is a prime.

It is not a weakly prime, because it can be changed into another prime (10212009461) 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, 5106004980 + 5106004981.

It is an arithmetic number, because the mean of its divisors is an integer number (5106004981).

Almost surely, 2^10212009961 is an apocalyptic number.

It is an amenable number.

10212009961 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212009961 is an equidigital number, since it uses as much as digits as its factorization.

10212009961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 10212009961 in words is "ten billion, two hundred twelve million, nine thousand, nine hundred sixty-one".