2010721506721 has 4 divisors (see below), whose sum is σ = 2010781381444. Its totient is φ = 2010661632000.

The previous prime is 2010721506671. The next prime is 2010721506763. The reversal of 2010721506721 is 1276051270102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86356050496 + 1924365456225 = 293864^2 + 1387215^2 .

It is a cyclic number.

It is not a de Polignac number, because 2010721506721 - 2⁷ = 2010721506593 is a prime.

It is a super-3 number, since 3×2010721506721³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2010721500721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29886960 + ... + 29954161.

It is an arithmetic number, because the mean of its divisors is an integer number (502695345361).

Almost surely, 2^{2010721506721} is an apocalyptic number.

It is an amenable number.

2010721506721 is a deficient number, since it is larger than the sum of its proper divisors (59874723).

2010721506721 is an equidigital number, since it uses as much as digits as its factorization.

2010721506721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59874722.

The product of its (nonzero) digits is 11760, while the sum is 34.

Adding to 2010721506721 its reverse (1276051270102), we get a palindrome (3286772776823).

The spelling of 2010721506721 in words is "two trillion, ten billion, seven hundred twenty-one million, five hundred six thousand, seven hundred twenty-one".