2795721721 has 16 divisors (see below), whose sum is σ = 3036928384. Its totient is φ = 2558335104.

The previous prime is 2795721671. The next prime is 2795721779. The reversal of 2795721721 is 1271275972.

It is not a de Polignac number, because 2795721721 - 2⁹ = 2795721209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2795721521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 966940 + ... + 969826.

It is an arithmetic number, because the mean of its divisors is an integer number (189808024).

Almost surely, 2^2795721721 is an apocalyptic number.

It is an amenable number.

2795721721 is a deficient number, since it is larger than the sum of its proper divisors (241206663).

2795721721 is a wasteful number, since it uses less digits than its factorization.

2795721721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520.

The product of its digits is 123480, while the sum is 43.

The square root of 2795721721 is about 52874.5848305214. The cubic root of 2795721721 is about 1408.7415159524.

The spelling of 2795721721 in words is "two billion, seven hundred ninety-five million, seven hundred twenty-one thousand, seven hundred twenty-one".