2121111121011 has 4 divisors (see below), whose sum is σ = 2828148161352. Its totient is φ = 1414074080672.

The previous prime is 2121111121007. The next prime is 2121111121079. The reversal of 2121111121011 is 1101211111212.

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 2121111121011 - 2² = 2121111121007 is a prime.

It is a super-2 number, since 2×2121111121011² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2121111121081) 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, 353518520166 + ... + 353518520171.

It is an arithmetic number, because the mean of its divisors is an integer number (707037040338).

Almost surely, 2^{2121111121011} is an apocalyptic number.

2121111121011 is a deficient number, since it is larger than the sum of its proper divisors (707037040341).

2121111121011 is an equidigital number, since it uses as much as digits as its factorization.

2121111121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707037040340.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 2121111121011 its reverse (1101211111212), we get a palindrome (3222322232223).

The spelling of 2121111121011 in words is "two trillion, one hundred twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, eleven".