12000121011 has 6 divisors (see below), whose sum is σ = 17333508140. Its totient is φ = 8000080668.

The previous prime is 12000120931. The next prime is 12000121031. The reversal of 12000121011 is 11012100021.

It is a happy number.

It is not a de Polignac number, because 12000121011 - 2⁷ = 12000120883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1333346779 = 12000121011 / (1 + 2 + 0 + 0 + 0 + 1 + 2 + 1 + 0 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12000120984 and 12000121002.

It is not an unprimeable number, because it can be changed into a prime (12000121031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 666673381 + ... + 666673398.

Almost surely, 2^12000121011 is an apocalyptic number.

12000121011 is a deficient number, since it is larger than the sum of its proper divisors (5333387129).

12000121011 is a wasteful number, since it uses less digits than its factorization.

12000121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333346785 (or 1333346782 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12000121011 its reverse (11012100021), we get a palindrome (23012221032).

The spelling of 12000121011 in words is "twelve billion, one hundred twenty-one thousand, eleven".