2705724021 has 32 divisors (see below), whose sum is σ = 4843819008. Its totient is φ = 1297448640.

The previous prime is 2705724017. The next prime is 2705724023. The reversal of 2705724021 is 1204275072.

It is not a de Polignac number, because 2705724021 - 2² = 2705724017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2705724021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2705724023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 447501 + ... + 453506.

It is an arithmetic number, because the mean of its divisors is an integer number (151369344).

Almost surely, 2^2705724021 is an apocalyptic number.

2705724021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2705724021 is a deficient number, since it is larger than the sum of its proper divisors (2138094987).

2705724021 is a wasteful number, since it uses less digits than its factorization.

2705724021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901041.

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 2705724021 is about 52016.5744835240. The cubic root of 2705724021 is about 1393.4599759675.

Adding to 2705724021 its reverse (1204275072), we get a palindrome (3909999093).

The spelling of 2705724021 in words is "two billion, seven hundred five million, seven hundred twenty-four thousand, twenty-one".