210121010032009 has 2 divisors, whose sum is σ = 210121010032010. Its totient is φ = 210121010032008.

The previous prime is 210121010031917. The next prime is 210121010032039. The reversal of 210121010032009 is 900230010121012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139926305612025 + 70194704419984 = 11829045^2 + 8378228^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121010032009 - 2¹¹ = 210121010029961 is a prime.

It is not a weakly prime, because it can be changed into another prime (210121010032039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060505016004 + 105060505016005.

It is an arithmetic number, because the mean of its divisors is an integer number (105060505016005).

Almost surely, 2^{210121010032009} is an apocalyptic number.

It is an amenable number.

210121010032009 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121010032009 is an equidigital number, since it uses as much as digits as its factorization.

210121010032009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 210121010032009 in words is "two hundred ten trillion, one hundred twenty-one billion, ten million, thirty-two thousand, nine".