3981224521 has 8 divisors (see below), whose sum is σ = 4024012104. Its totient is φ = 3938636160.

The previous prime is 3981224503. The next prime is 3981224539. The reversal of 3981224521 is 1254221893.

3981224521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3981224503) and next prime (3981224539).

It can be written as a sum of positive squares in 4 ways, for example, as 1517492025 + 2463732496 = 38955^2 + 49636^2 .

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 3981224521 - 2¹⁷ = 3981093449 is a prime.

It is a super-2 number, since 2×3981224521² = 31700297373223358882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981224501) 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, 9450 + ... + 89731.

It is an arithmetic number, because the mean of its divisors is an integer number (503001513).

Almost surely, 2^3981224521 is an apocalyptic number.

It is an amenable number.

3981224521 is a deficient number, since it is larger than the sum of its proper divisors (42787583).

3981224521 is a wasteful number, since it uses less digits than its factorization.

3981224521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99611.

The product of its digits is 34560, while the sum is 37.

The square root of 3981224521 is about 63096.9454173496. The cubic root of 3981224521 is about 1584.9134711791.

The spelling of 3981224521 in words is "three billion, nine hundred eighty-one million, two hundred twenty-four thousand, five hundred twenty-one".