20100011091 has 16 divisors (see below), whose sum is σ = 27529077504. Its totient is φ = 13035600864.

The previous prime is 20100011089. The next prime is 20100011131. The reversal of 20100011091 is 19011000102.

It is not a de Polignac number, because 20100011091 - 2¹ = 20100011089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20100011091.

It is not an unprimeable number, because it can be changed into a prime (20100011021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 845530 + ... + 868976.

It is an arithmetic number, because the mean of its divisors is an integer number (1720567344).

Almost surely, 2^20100011091 is an apocalyptic number.

20100011091 is a deficient number, since it is larger than the sum of its proper divisors (7429066413).

20100011091 is a wasteful number, since it uses less digits than its factorization.

20100011091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31210.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 20100011091 its reverse (19011000102), we get a palindrome (39111011193).

The spelling of 20100011091 in words is "twenty billion, one hundred million, eleven thousand, ninety-one".