2121122011 has 4 divisors (see below), whose sum is σ = 2245893912. Its totient is φ = 1996350112.

The previous prime is 2121122009. The next prime is 2121122023. The reversal of 2121122011 is 1102211212.

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 2121122011 - 2¹ = 2121122009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121121982 and 2121122000.

It is not an unprimeable number, because it can be changed into a prime (2121122071) 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 3 ways as a sum of consecutive naturals, for example, 62385925 + ... + 62385958.

It is an arithmetic number, because the mean of its divisors is an integer number (561473478).

Almost surely, 2^2121122011 is an apocalyptic number.

2121122011 is a deficient number, since it is larger than the sum of its proper divisors (124771901).

2121122011 is a wasteful number, since it uses less digits than its factorization.

2121122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124771900.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2121122011 is about 46055.6403820422. The cubic root of 2121122011 is about 1284.8582483797.

Adding to 2121122011 its reverse (1102211212), we get a palindrome (3223333223).

The spelling of 2121122011 in words is "two billion, one hundred twenty-one million, one hundred twenty-two thousand, eleven".