1211001100009 has 8 divisors (see below), whose sum is σ = 1257634317960. Its totient is φ = 1164692852736.

The previous prime is 1211001099977. The next prime is 1211001100021. The reversal of 1211001100009 is 9000011001121.

It can be written as a sum of positive squares in 4 ways, for example, as 778073947225 + 432927152784 = 882085^2 + 657972^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211001100009 - 2⁵ = 1211001099977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211001099965 and 1211001100001.

It is not an unprimeable number, because it can be changed into a prime (1211001100069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81235074 + ... + 81249979.

It is an arithmetic number, because the mean of its divisors is an integer number (157204289745).

Almost surely, 2^{1211001100009} is an apocalyptic number.

It is an amenable number.

1211001100009 is a deficient number, since it is larger than the sum of its proper divisors (46633217951).

1211001100009 is a wasteful number, since it uses less digits than its factorization.

1211001100009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162485339.

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

The spelling of 1211001100009 in words is "one trillion, two hundred eleven billion, one million, one hundred thousand, nine".