12011121001 has 4 divisors (see below), whose sum is σ = 13103041104. Its totient is φ = 10919200900.

The previous prime is 12011120987. The next prime is 12011121013. The reversal of 12011121001 is 10012111021.

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 12011121001 - 2⁹ = 12011120489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12011121701) 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, 545960035 + ... + 545960056.

It is an arithmetic number, because the mean of its divisors is an integer number (3275760276).

Almost surely, 2^12011121001 is an apocalyptic number.

12011121001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12011121001 is a deficient number, since it is larger than the sum of its proper divisors (1091920103).

12011121001 is a wasteful number, since it uses less digits than its factorization.

12011121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091920102.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 12011121001 its reverse (10012111021), we get a palindrome (22023232022).

The spelling of 12011121001 in words is "twelve billion, eleven million, one hundred twenty-one thousand, one".