2121220020011 has 4 divisors (see below), whose sum is σ = 2121236433912. Its totient is φ = 2121203606112.

The previous prime is 2121220019987. The next prime is 2121220020041. The reversal of 2121220020011 is 1100200221212.

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 2121220020011 - 2³⁴ = 2104040150827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121220020041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8011550 + ... + 8272083.

It is an arithmetic number, because the mean of its divisors is an integer number (530309108478).

Almost surely, 2^{2121220020011} is an apocalyptic number.

2121220020011 is a deficient number, since it is larger than the sum of its proper divisors (16413901).

2121220020011 is a wasteful number, since it uses less digits than its factorization.

2121220020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16413900.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2121220020011 its reverse (1100200221212), we get a palindrome (3221420241223).

The spelling of 2121220020011 in words is "two trillion, one hundred twenty-one billion, two hundred twenty million, twenty thousand, eleven".