2011221131321 has 4 divisors (see below), whose sum is σ = 2012767036644. Its totient is φ = 2009675226000.

The previous prime is 2011221131281. The next prime is 2011221131323. The reversal of 2011221131321 is 1231311221102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 865711150096 + 1145509981225 = 930436^2 + 1070285^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011221131321 - 2³⁸ = 1736343224377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011221131293 and 2011221131302.

It is not an unprimeable number, because it can be changed into a prime (2011221131323) 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 3 ways as a sum of consecutive naturals, for example, 772950710 + ... + 772953311.

It is an arithmetic number, because the mean of its divisors is an integer number (503191759161).

Almost surely, 2^{2011221131321} is an apocalyptic number.

It is an amenable number.

2011221131321 is a deficient number, since it is larger than the sum of its proper divisors (1545905323).

2011221131321 is a wasteful number, since it uses less digits than its factorization.

2011221131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545905322.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 2011221131321 its reverse (1231311221102), we get a palindrome (3242532352423).

The spelling of 2011221131321 in words is "two trillion, eleven billion, two hundred twenty-one million, one hundred thirty-one thousand, three hundred twenty-one".