2791060021 has 4 divisors (see below), whose sum is σ = 2887303500. Its totient is φ = 2694816544.

The previous prime is 2791060009. The next prime is 2791060031. The reversal of 2791060021 is 1200601972.

It is a happy number.

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 943349796 + 1847710225 = 30714^2 + 42985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2791060021 - 2⁷ = 2791059893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2791060031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48121696 + ... + 48121753.

It is an arithmetic number, because the mean of its divisors is an integer number (721825875).

Almost surely, 2^2791060021 is an apocalyptic number.

It is an amenable number.

2791060021 is a deficient number, since it is larger than the sum of its proper divisors (96243479).

2791060021 is an equidigital number, since it uses as much as digits as its factorization.

2791060021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96243478.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 2791060021 is about 52830.4838232625. The cubic root of 2791060021 is about 1407.9580827324.

Adding to 2791060021 its reverse (1200601972), we get a palindrome (3991661993).

The spelling of 2791060021 in words is "two billion, seven hundred ninety-one million, sixty thousand, twenty-one".