2021131111111 has 8 divisors (see below), whose sum is σ = 2310874142720. Its totient is φ = 1731640583448.

The previous prime is 2021131111091. The next prime is 2021131111117. The reversal of 2021131111111 is 1111111311202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2021131111111 - 2⁷ = 2021131110983 is a prime.

It is a Duffinian number.

2021131111111 is a modest number, since divided by 1111111 gives 202113 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021131111117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63108831 + ... + 63140848.

It is an arithmetic number, because the mean of its divisors is an integer number (288859267840).

Almost surely, 2^{2021131111111} is an apocalyptic number.

2021131111111 is a deficient number, since it is larger than the sum of its proper divisors (289743031609).

2021131111111 is a wasteful number, since it uses less digits than its factorization.

2021131111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126251973.

The product of its (nonzero) digits is 12, while the sum is 16.

Adding to 2021131111111 its reverse (1111111311202), we get a palindrome (3132242422313).

The spelling of 2021131111111 in words is "two trillion, twenty-one billion, one hundred thirty-one million, one hundred eleven thousand, one hundred eleven".