12121001011 has 32 divisors (see below), whose sum is σ = 14393143296. Its totient is φ = 9992160000.

The previous prime is 12121000993. The next prime is 12121001017. The reversal of 12121001011 is 11010012121.

It is a cyclic number.

It is not a de Polignac number, because 12121001011 - 2²¹ = 12118903859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12121001017) 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 31 ways as a sum of consecutive naturals, for example, 7854706 + ... + 7856248.

It is an arithmetic number, because the mean of its divisors is an integer number (449785728).

Almost surely, 2^12121001011 is an apocalyptic number.

12121001011 is a deficient number, since it is larger than the sum of its proper divisors (2272142285).

12121001011 is a wasteful number, since it uses less digits than its factorization.

12121001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963.

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

Adding to 12121001011 its reverse (11010012121), we get a palindrome (23131013132).

The spelling of 12121001011 in words is "twelve billion, one hundred twenty-one million, one thousand, eleven".