1000121112191 has 16 divisors (see below), whose sum is σ = 1079757557760. Its totient is φ = 923639967360.

The previous prime is 1000121112181. The next prime is 1000121112197. The reversal of 1000121112191 is 1912111210001.

It is a cyclic number.

It is not a de Polignac number, because 1000121112191 - 2²² = 1000116917887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000121112197) 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, 1311011 + ... + 1928468.

It is an arithmetic number, because the mean of its divisors is an integer number (67484847360).

Almost surely, 2^{1000121112191} is an apocalyptic number.

1000121112191 is a deficient number, since it is larger than the sum of its proper divisors (79636445569).

1000121112191 is a wasteful number, since it uses less digits than its factorization.

1000121112191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239966.

The product of its (nonzero) digits is 36, while the sum is 20.

Adding to 1000121112191 its reverse (1912111210001), we get a palindrome (2912232322192).

The spelling of 1000121112191 in words is "one trillion, one hundred twenty-one million, one hundred twelve thousand, one hundred ninety-one".