10212009989 has 2 divisors, whose sum is σ = 10212009990. Its totient is φ = 10212009988.

The previous prime is 10212009979. The next prime is 10212010001. The reversal of 10212009989 is 98990021201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10192517764 + 19492225 = 100958^2 + 4415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10212009989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10212009979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106004994 + 5106004995.

It is an arithmetic number, because the mean of its divisors is an integer number (5106004995).

Almost surely, 2^10212009989 is an apocalyptic number.

It is an amenable number.

10212009989 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212009989 is an equidigital number, since it uses as much as digits as its factorization.

10212009989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The spelling of 10212009989 in words is "ten billion, two hundred twelve million, nine thousand, nine hundred eighty-nine".