2011323131021 has 4 divisors (see below), whose sum is σ = 2117182243200. Its totient is φ = 1905464018844.

The previous prime is 2011323130991. The next prime is 2011323131033. The reversal of 2011323131021 is 1201313231102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011323131021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2011323130984 and 2011323131002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011323131221) 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, 52929556061 + ... + 52929556098.

It is an arithmetic number, because the mean of its divisors is an integer number (529295560800).

Almost surely, 2^{2011323131021} is an apocalyptic number.

It is an amenable number.

2011323131021 is a deficient number, since it is larger than the sum of its proper divisors (105859112179).

2011323131021 is a wasteful number, since it uses less digits than its factorization.

2011323131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105859112178.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 2011323131021 its reverse (1201313231102), we get a palindrome (3212636362123).

The spelling of 2011323131021 in words is "two trillion, eleven billion, three hundred twenty-three million, one hundred thirty-one thousand, twenty-one".