10991209011 has 32 divisors (see below), whose sum is σ = 15370122048. Its totient is φ = 6979737600.

The previous prime is 10991209007. The next prime is 10991209037. The reversal of 10991209011 is 11090219901.

It is not a de Polignac number, because 10991209011 - 2² = 10991209007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10991209051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1105161 + ... + 1115061.

It is an arithmetic number, because the mean of its divisors is an integer number (480316314).

Almost surely, 2^10991209011 is an apocalyptic number.

10991209011 is a deficient number, since it is larger than the sum of its proper divisors (4378913037).

10991209011 is a wasteful number, since it uses less digits than its factorization.

10991209011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10151.

The product of its (nonzero) digits is 1458, while the sum is 33.

The spelling of 10991209011 in words is "ten billion, nine hundred ninety-one million, two hundred nine thousand, eleven".