10001111121 has 16 divisors (see below), whose sum is σ = 14819061120. Its totient is φ = 6666237360.

The previous prime is 10001111093. The next prime is 10001111123. The reversal of 10001111121 is 12111110001.

It is not a de Polignac number, because 10001111121 - 2¹¹ = 10001109073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (10001111123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141051 + ... + 199743.

It is an arithmetic number, because the mean of its divisors is an integer number (926191320).

Almost surely, 2^10001111121 is an apocalyptic number.

It is an amenable number.

10001111121 is a deficient number, since it is larger than the sum of its proper divisors (4817949999).

10001111121 is an equidigital number, since it uses as much as digits as its factorization.

10001111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65013 (or 65007 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 10001111121 its reverse (12111110001), we get a palindrome (22112221122).

The spelling of 10001111121 in words is "ten billion, one million, one hundred eleven thousand, one hundred twenty-one".