3981357321 has 8 divisors (see below), whose sum is σ = 5340264384. Its totient is φ = 2638344240.

The previous prime is 3981357319. The next prime is 3981357377. The reversal of 3981357321 is 1237531893.

3981357321 is digitally balanced in base 2 and base 4, because in such bases 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 not a de Polignac number, because 3981357321 - 2¹ = 3981357319 is a prime.

It is a super-2 number, since 2×3981357321² = 31702412234960594082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3981357221) 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, 3972910 + ... + 3973911.

It is an arithmetic number, because the mean of its divisors is an integer number (667533048).

Almost surely, 2^3981357321 is an apocalyptic number.

It is an amenable number.

3981357321 is a deficient number, since it is larger than the sum of its proper divisors (1358907063).

3981357321 is a wasteful number, since it uses less digits than its factorization.

3981357321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7946991.

The product of its digits is 136080, while the sum is 42.

The square root of 3981357321 is about 63097.9977574566. The cubic root of 3981357321 is about 1584.9310934096.

The spelling of 3981357321 in words is "three billion, nine hundred eighty-one million, three hundred fifty-seven thousand, three hundred twenty-one".