2021320061 has 2 divisors, whose sum is σ = 2021320062. Its totient is φ = 2021320060.

The previous prime is 2021320033. The next prime is 2021320099. The reversal of 2021320061 is 1600231202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2002562500 + 18757561 = 44750^2 + 4331^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021320061 - 2¹⁴ = 2021303677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021329061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010660030 + 1010660031.

It is an arithmetic number, because the mean of its divisors is an integer number (1010660031).

Almost surely, 2^2021320061 is an apocalyptic number.

It is an amenable number.

2021320061 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021320061 is an equidigital number, since it uses as much as digits as its factorization.

2021320061 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 17.

The square root of 2021320061 is about 44959.0931959264. The cubic root of 2021320061 is about 1264.3821676369.

Adding to 2021320061 its reverse (1600231202), we get a palindrome (3621551263).

The spelling of 2021320061 in words is "two billion, twenty-one million, three hundred twenty thousand, sixty-one".