2021310331111 has 4 divisors (see below), whose sum is σ = 2127695085400. Its totient is φ = 1914925576824.

The previous prime is 2021310331109. The next prime is 2021310331127. The reversal of 2021310331111 is 1111330131202.

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 2021310331111 - 2¹ = 2021310331109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 106384754269 = 2021310331111 / (2 + 0 + 2 + 1 + 3 + 1 + 0 + 3 + 3 + 1 + 1 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021310331151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53192377116 + ... + 53192377153.

It is an arithmetic number, because the mean of its divisors is an integer number (531923771350).

Almost surely, 2^{2021310331111} is an apocalyptic number.

2021310331111 is a deficient number, since it is larger than the sum of its proper divisors (106384754289).

2021310331111 is a wasteful number, since it uses less digits than its factorization.

2021310331111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106384754288.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 2021310331111 its reverse (1111330131202), we get a palindrome (3132640462313).

The spelling of 2021310331111 in words is "two trillion, twenty-one billion, three hundred ten million, three hundred thirty-one thousand, one hundred eleven".