121131111001 has 4 divisors (see below), whose sum is σ = 121245064192. Its totient is φ = 121017157812.

The previous prime is 121131110993. The next prime is 121131111043. The reversal of 121131111001 is 100111131121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121131111001 - 2³ = 121131110993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121131111071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56975001 + ... + 56977126.

It is an arithmetic number, because the mean of its divisors is an integer number (30311266048).

Almost surely, 2^121131111001 is an apocalyptic number.

It is an amenable number.

121131111001 is a deficient number, since it is larger than the sum of its proper divisors (113953191).

121131111001 is a wasteful number, since it uses less digits than its factorization.

121131111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113953190.

The product of its (nonzero) digits is 6, while the sum is 13.

Adding to 121131111001 its reverse (100111131121), we get a palindrome (221242242122).

The spelling of 121131111001 in words is "one hundred twenty-one billion, one hundred thirty-one million, one hundred eleven thousand, one".