2021320123 has 2 divisors, whose sum is σ = 2021320124. Its totient is φ = 2021320122.

The previous prime is 2021320099. The next prime is 2021320139. The reversal of 2021320123 is 3210231202.

It is an a-pointer prime, because the next prime (2021320139) can be obtained adding 2021320123 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021320123 - 2²¹ = 2019222971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021320097 and 2021320106.

It is not a weakly prime, because it can be changed into another prime (2021320183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010660061 + 1010660062.

It is an arithmetic number, because the mean of its divisors is an integer number (1010660062).

Almost surely, 2^2021320123 is an apocalyptic number.

2021320123 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021320123 is an equidigital number, since it uses as much as digits as its factorization.

2021320123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2021320123 is about 44959.0938854421. The cubic root of 2021320123 is about 1264.3821805644.

Adding to 2021320123 its reverse (3210231202), we get a palindrome (5231551325).

The spelling of 2021320123 in words is "two billion, twenty-one million, three hundred twenty thousand, one hundred twenty-three".