2011120921 has 2 divisors, whose sum is σ = 2011120922. Its totient is φ = 2011120920.

The previous prime is 2011120919. The next prime is 2011120967. The reversal of 2011120921 is 1290211102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1327873600 + 683247321 = 36440^2 + 26139^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011120921 - 2¹ = 2011120919 is a prime.

Together with 2011120919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2011120421) 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 as a sum of consecutive naturals, namely, 1005560460 + 1005560461.

It is an arithmetic number, because the mean of its divisors is an integer number (1005560461).

Almost surely, 2^2011120921 is an apocalyptic number.

It is an amenable number.

2011120921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011120921 is an equidigital number, since it uses as much as digits as its factorization.

2011120921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 2011120921 is about 44845.5228646071. The cubic root of 2011120921 is about 1262.2519819437.

The spelling of 2011120921 in words is "two billion, eleven million, one hundred twenty thousand, nine hundred twenty-one".