2021011243 has 2 divisors, whose sum is σ = 2021011244. Its totient is φ = 2021011242.

The previous prime is 2021011229. The next prime is 2021011253. The reversal of 2021011243 is 3421101202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021011243 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021011253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010505621 + 1010505622.

It is an arithmetic number, because the mean of its divisors is an integer number (1010505622).

Almost surely, 2^2021011243 is an apocalyptic number.

2021011243 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021011243 is an equidigital number, since it uses as much as digits as its factorization.

2021011243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2021011243 is about 44955.6586315894. The cubic root of 2021011243 is about 1264.3177734379.

Adding to 2021011243 its reverse (3421101202), we get a palindrome (5442112445).

The spelling of 2021011243 in words is "two billion, twenty-one million, eleven thousand, two hundred forty-three".