2021113243 has 4 divisors (see below), whose sum is σ = 2041949560. Its totient is φ = 2000276928.

The previous prime is 2021113229. The next prime is 2021113249. The reversal of 2021113243 is 3423111202.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021113243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021113243.

It is not an unprimeable number, because it can be changed into a prime (2021113249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10418013 + ... + 10418206.

It is an arithmetic number, because the mean of its divisors is an integer number (510487390).

Almost surely, 2^2021113243 is an apocalyptic number.

2021113243 is a deficient number, since it is larger than the sum of its proper divisors (20836317).

2021113243 is an equidigital number, since it uses as much as digits as its factorization.

2021113243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20836316.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2021113243 is about 44956.7930684563. The cubic root of 2021113243 is about 1264.3390430282.

Adding to 2021113243 its reverse (3423111202), we get a palindrome (5444224445).

The spelling of 2021113243 in words is "two billion, twenty-one million, one hundred thirteen thousand, two hundred forty-three".