2021064761 has 2 divisors, whose sum is σ = 2021064762. Its totient is φ = 2021064760.

The previous prime is 2021064707. The next prime is 2021064769. The reversal of 2021064761 is 1674601202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1220174761 + 800890000 = 34931^2 + 28300^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021064761 - 2⁶ = 2021064697 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 (2021064769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010532380 + 1010532381.

It is an arithmetic number, because the mean of its divisors is an integer number (1010532381).

Almost surely, 2^2021064761 is an apocalyptic number.

It is an amenable number.

2021064761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021064761 is an equidigital number, since it uses as much as digits as its factorization.

2021064761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 2021064761 is about 44956.2538586124. The cubic root of 2021064761 is about 1264.3289333892.

Adding to 2021064761 its reverse (1674601202), we get a palindrome (3695665963).

The spelling of 2021064761 in words is "two billion, twenty-one million, sixty-four thousand, seven hundred sixty-one".