2021011823 has 2 divisors, whose sum is σ = 2021011824. Its totient is φ = 2021011822.

The previous prime is 2021011819. The next prime is 2021011873. The reversal of 2021011823 is 3281101202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021011823 - 2² = 2021011819 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021011795 and 2021011804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021011873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010505911 + 1010505912.

It is an arithmetic number, because the mean of its divisors is an integer number (1010505912).

Almost surely, 2^2021011823 is an apocalyptic number.

2021011823 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021011823 is an equidigital number, since it uses as much as digits as its factorization.

2021011823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 2021011823 is about 44955.6650823898. The cubic root of 2021011823 is about 1264.3178943847.

The spelling of 2021011823 in words is "two billion, twenty-one million, eleven thousand, eight hundred twenty-three".