221011010102009 has 2 divisors, whose sum is σ = 221011010102010. Its totient is φ = 221011010102008.

The previous prime is 221011010101993. The next prime is 221011010102039. The reversal of 221011010102009 is 900201010110122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192952324369984 + 28058685732025 = 13890728^2 + 5297045^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011010102009 - 2⁴ = 221011010101993 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221011010102039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505505051004 + 110505505051005.

It is an arithmetic number, because the mean of its divisors is an integer number (110505505051005).

Almost surely, 2^{221011010102009} is an apocalyptic number.

It is an amenable number.

221011010102009 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011010102009 is an equidigital number, since it uses as much as digits as its factorization.

221011010102009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 221011010102009 in words is "two hundred twenty-one trillion, eleven billion, ten million, one hundred two thousand, nine".