3937216321 has 8 divisors (see below), whose sum is σ = 4001439744. Its totient is φ = 3873236640.

The previous prime is 3937216307. The next prime is 3937216331. The reversal of 3937216321 is 1236127393.

It is a happy number.

3937216321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3937216321 - 2²¹ = 3935119169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3937216331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28225 + ... + 93118.

It is an arithmetic number, because the mean of its divisors is an integer number (500179968).

Almost surely, 2^3937216321 is an apocalyptic number.

It is an amenable number.

3937216321 is a deficient number, since it is larger than the sum of its proper divisors (64223423).

3937216321 is a wasteful number, since it uses less digits than its factorization.

3937216321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121871.

The product of its digits is 40824, while the sum is 37.

The square root of 3937216321 is about 62747.2415409634. The cubic root of 3937216321 is about 1579.0519764171.

The spelling of 3937216321 in words is "three billion, nine hundred thirty-seven million, two hundred sixteen thousand, three hundred twenty-one".