2021230111 has 4 divisors (see below), whose sum is σ = 2025653392. Its totient is φ = 2016806832.

The previous prime is 2021230109. The next prime is 2021230129. The reversal of 2021230111 is 1110321202.

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 2021230111 - 2¹ = 2021230109 is a prime.

It is a super-2 number, since 2×2021230111² = 8170742323226144642, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 2021230091 and 2021230100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021230151) 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, 2210955 + ... + 2211868.

It is an arithmetic number, because the mean of its divisors is an integer number (506413348).

Almost surely, 2^2021230111 is an apocalyptic number.

2021230111 is a deficient number, since it is larger than the sum of its proper divisors (4423281).

2021230111 is an equidigital number, since it uses as much as digits as its factorization.

2021230111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4423280.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2021230111 is about 44958.0928309910. The cubic root of 2021230111 is about 1264.3634120944.

Adding to 2021230111 its reverse (1110321202), we get a palindrome (3131551313).

The spelling of 2021230111 in words is "two billion, twenty-one million, two hundred thirty thousand, one hundred eleven".