2021210221073 has 2 divisors, whose sum is σ = 2021210221074. Its totient is φ = 2021210221072.

The previous prime is 2021210221039. The next prime is 2021210221091. The reversal of 2021210221073 is 3701220121202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1245239505409 + 775970715664 = 1115903^2 + 880892^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021210221073 - 2⁸ = 2021210220817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2021210221013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010605110536 + 1010605110537.

It is an arithmetic number, because the mean of its divisors is an integer number (1010605110537).

Almost surely, 2^{2021210221073} is an apocalyptic number.

It is an amenable number.

2021210221073 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021210221073 is an equidigital number, since it uses as much as digits as its factorization.

2021210221073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

Adding to 2021210221073 its reverse (3701220121202), we get a palindrome (5722430342275).

The spelling of 2021210221073 in words is "two trillion, twenty-one billion, two hundred ten million, two hundred twenty-one thousand, seventy-three".