2021531273 has 2 divisors, whose sum is σ = 2021531274. Its totient is φ = 2021531272.

The previous prime is 2021531243. The next prime is 2021531279. The reversal of 2021531273 is 3721351202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2021131849 + 399424 = 44957^2 + 632^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021531273 - 2⁶ = 2021531209 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021531279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010765636 + 1010765637.

It is an arithmetic number, because the mean of its divisors is an integer number (1010765637).

Almost surely, 2^2021531273 is an apocalyptic number.

It is an amenable number.

2021531273 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021531273 is an equidigital number, since it uses as much as digits as its factorization.

2021531273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 2021531273 is about 44961.4420698447. The cubic root of 2021531273 is about 1264.4262054237.

Adding to 2021531273 its reverse (3721351202), we get a palindrome (5742882475).

The spelling of 2021531273 in words is "two billion, twenty-one million, five hundred thirty-one thousand, two hundred seventy-three".