2121312011 has 16 divisors (see below), whose sum is σ = 2724363264. Its totient is φ = 1605425184.

The previous prime is 2121312007. The next prime is 2121312031. The reversal of 2121312011 is 1102131212.

It is a cyclic number.

It is not a de Polignac number, because 2121312011 - 2² = 2121312007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121312031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 504671 + ... + 508856.

It is an arithmetic number, because the mean of its divisors is an integer number (170272704).

Almost surely, 2^2121312011 is an apocalyptic number.

2121312011 is a deficient number, since it is larger than the sum of its proper divisors (603051253).

2121312011 is a wasteful number, since it uses less digits than its factorization.

2121312011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013570.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 2121312011 is about 46057.7030582290. The cubic root of 2121312011 is about 1284.8966110603.

Adding to 2121312011 its reverse (1102131212), we get a palindrome (3223443223).

The spelling of 2121312011 in words is "two billion, one hundred twenty-one million, three hundred twelve thousand, eleven".