2021312243 has 4 divisors (see below), whose sum is σ = 2109195408. Its totient is φ = 1933429080.

The previous prime is 2021312233. The next prime is 2021312261. The reversal of 2021312243 is 3422131202.

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 2021312243 - 2⁶ = 2021312179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021312203) 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, 43941548 + ... + 43941593.

It is an arithmetic number, because the mean of its divisors is an integer number (527298852).

Almost surely, 2^2021312243 is an apocalyptic number.

2021312243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2021312243 is a deficient number, since it is larger than the sum of its proper divisors (87883165).

2021312243 is an equidigital number, since it uses as much as digits as its factorization.

2021312243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87883164.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 2021312243 is about 44959.0062501386. The cubic root of 2021312243 is about 1264.3805375219.

Adding to 2021312243 its reverse (3422131202), we get a palindrome (5443443445).

The spelling of 2021312243 in words is "two billion, twenty-one million, three hundred twelve thousand, two hundred forty-three".