2684945721 has 16 divisors (see below), whose sum is σ = 3703569408. Its totient is φ = 1729008000.

The previous prime is 2684945719. The next prime is 2684945729. The reversal of 2684945721 is 1275494862.

It is not a de Polignac number, because 2684945721 - 2¹ = 2684945719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2684945729) 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, 95641 + ... + 120486.

It is an arithmetic number, because the mean of its divisors is an integer number (231473088).

Almost surely, 2^2684945721 is an apocalyptic number.

It is an amenable number.

2684945721 is a deficient number, since it is larger than the sum of its proper divisors (1018623687).

2684945721 is a wasteful number, since it uses less digits than its factorization.

2684945721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216272.

The product of its digits is 967680, while the sum is 48.

The square root of 2684945721 is about 51816.4618726520. The cubic root of 2684945721 is about 1389.8838336057.

The spelling of 2684945721 in words is "two billion, six hundred eighty-four million, nine hundred forty-five thousand, seven hundred twenty-one".