2812105721 has 2 divisors, whose sum is σ = 2812105722. Its totient is φ = 2812105720.

The previous prime is 2812105693. The next prime is 2812105771. The reversal of 2812105721 is 1275012182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1568556025 + 1243549696 = 39605^2 + 35264^2 .

It is a cyclic number.

It is not a de Polignac number, because 2812105721 - 2¹⁴ = 2812089337 is a prime.

It is not a weakly prime, because it can be changed into another prime (2812105771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1406052860 + 1406052861.

It is an arithmetic number, because the mean of its divisors is an integer number (1406052861).

Almost surely, 2^2812105721 is an apocalyptic number.

It is an amenable number.

2812105721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2812105721 is an equidigital number, since it uses as much as digits as its factorization.

2812105721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 2812105721 is about 53029.2911606406. The cubic root of 2812105721 is about 1411.4880792178.

The spelling of 2812105721 in words is "two billion, eight hundred twelve million, one hundred five thousand, seven hundred twenty-one".