12020121011 has 4 divisors (see below), whose sum is σ = 12542734992. Its totient is φ = 11497507032.

The previous prime is 12020121007. The next prime is 12020121013. The reversal of 12020121011 is 11012102021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12020121011 - 2² = 12020121007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12020120983 and 12020121001.

It is not an unprimeable number, because it can be changed into a prime (12020121013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261306956 + ... + 261307001.

It is an arithmetic number, because the mean of its divisors is an integer number (3135683748).

Almost surely, 2^12020121011 is an apocalyptic number.

12020121011 is a deficient number, since it is larger than the sum of its proper divisors (522613981).

12020121011 is an equidigital number, since it uses as much as digits as its factorization.

12020121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522613980.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12020121011 its reverse (11012102021), we get a palindrome (23032223032).

The spelling of 12020121011 in words is "twelve billion, twenty million, one hundred twenty-one thousand, eleven".