2121111011 has 4 divisors (see below), whose sum is σ = 2194252800. Its totient is φ = 2047969224.

The previous prime is 2121111007. The next prime is 2121111019. The reversal of 2121111011 is 1101111212.

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 2121111011 - 2² = 2121111007 is a prime.

It is a super-2 number, since 2×2121111011² = 8998223841970884242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121110983 and 2121111001.

It is not an unprimeable number, because it can be changed into a prime (2121111019) 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, 36570851 + ... + 36570908.

It is an arithmetic number, because the mean of its divisors is an integer number (548563200).

Almost surely, 2^2121111011 is an apocalyptic number.

2121111011 is a deficient number, since it is larger than the sum of its proper divisors (73141789).

2121111011 is an equidigital number, since it uses as much as digits as its factorization.

2121111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73141788.

The product of its (nonzero) digits is 4, while the sum is 11.

The square root of 2121111011 is about 46055.5209611182. The cubic root of 2121111011 is about 1284.8560273123.

Adding to 2121111011 its reverse (1101111212), we get a palindrome (3222222223).

The spelling of 2121111011 in words is "two billion, one hundred twenty-one million, one hundred eleven thousand, eleven".