11011021009 has 2 divisors, whose sum is σ = 11011021010. Its totient is φ = 11011021008.

The previous prime is 11011020997. The next prime is 11011021039. The reversal of 11011021009 is 90012011011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10206050625 + 804970384 = 101025^2 + 28372^2 .

It is a cyclic number.

It is not a de Polignac number, because 11011021009 - 2²¹ = 11008923857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11011020983 and 11011021001.

It is not a weakly prime, because it can be changed into another prime (11011021039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505510504 + 5505510505.

It is an arithmetic number, because the mean of its divisors is an integer number (5505510505).

Almost surely, 2^11011021009 is an apocalyptic number.

It is an amenable number.

11011021009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011021009 is an equidigital number, since it uses as much as digits as its factorization.

11011021009 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 11011021009 in words is "eleven billion, eleven million, twenty-one thousand, nine".