211001101009 has 4 divisors (see below), whose sum is σ = 211089871204. Its totient is φ = 210912330816.

The previous prime is 211001100971. The next prime is 211001101019. The reversal of 211001101009 is 900101100112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73932329025 + 137068771984 = 271905^2 + 370228^2 .

It is a cyclic number.

It is not a de Polignac number, because 211001101009 - 2²¹ = 210999003857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211001100983 and 211001101001.

It is not an unprimeable number, because it can be changed into a prime (211001101019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44381532 + ... + 44386285.

It is an arithmetic number, because the mean of its divisors is an integer number (52772467801).

Almost surely, 2^211001101009 is an apocalyptic number.

It is an amenable number.

211001101009 is a deficient number, since it is larger than the sum of its proper divisors (88770195).

211001101009 is an equidigital number, since it uses as much as digits as its factorization.

211001101009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88770194.

The product of its (nonzero) digits is 18, while the sum is 16.

The spelling of 211001101009 in words is "two hundred eleven billion, one million, one hundred one thousand, nine".