3216475721 has 4 divisors (see below), whose sum is σ = 3216667392. Its totient is φ = 3216284052.

The previous prime is 3216475709. The next prime is 3216475727. The reversal of 3216475721 is 1275746123.

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.

It is a cyclic number.

It is not a de Polignac number, because 3216475721 - 2³⁰ = 2142733897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3216475727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67961 + ... + 105126.

It is an arithmetic number, because the mean of its divisors is an integer number (804166848).

Almost surely, 2^3216475721 is an apocalyptic number.

It is an amenable number.

3216475721 is a deficient number, since it is larger than the sum of its proper divisors (191671).

3216475721 is a wasteful number, since it uses less digits than its factorization.

3216475721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191670.

The product of its digits is 70560, while the sum is 38.

The square root of 3216475721 is about 56713.9817064540. The cubic root of 3216475721 is about 1476.1373162262.

The spelling of 3216475721 in words is "three billion, two hundred sixteen million, four hundred seventy-five thousand, seven hundred twenty-one".