3245667721 has 4 divisors (see below), whose sum is σ = 3248756944. Its totient is φ = 3242578500.

The previous prime is 3245667643. The next prime is 3245667743. The reversal of 3245667721 is 1277665423.

3245667721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1277665423 = 727 ⋅1757449.

It is a cyclic number.

It is not a de Polignac number, because 3245667721 - 2¹¹ = 3245665673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3245167721) 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, 1543035 + ... + 1545136.

It is an arithmetic number, because the mean of its divisors is an integer number (812189236).

Almost surely, 2^3245667721 is an apocalyptic number.

It is an amenable number.

3245667721 is a deficient number, since it is larger than the sum of its proper divisors (3089223).

3245667721 is a wasteful number, since it uses less digits than its factorization.

3245667721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089222.

The product of its digits is 423360, while the sum is 43.

The square root of 3245667721 is about 56970.7619836702. The cubic root of 3245667721 is about 1480.5895692548.

The spelling of 3245667721 in words is "three billion, two hundred forty-five million, six hundred sixty-seven thousand, seven hundred twenty-one".