3987654433221 has 16 divisors (see below), whose sum is σ = 5328123067584. Its totient is φ = 2652814101504.

The previous prime is 3987654433183. The next prime is 3987654433271. The reversal of 3987654433221 is 1223344567893.

It is not a de Polignac number, because 3987654433221 - 2¹⁹ = 3987653908933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987654433271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4861566 + ... + 5622288.

It is an arithmetic number, because the mean of its divisors is an integer number (333007691724).

Almost surely, 2^{3987654433221} is an apocalyptic number.

It is an amenable number.

3987654433221 is a deficient number, since it is larger than the sum of its proper divisors (1340468634363).

3987654433221 is a wasteful number, since it uses less digits than its factorization.

3987654433221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764420.

The product of its digits is 26127360, while the sum is 57.

The spelling of 3987654433221 in words is "three trillion, nine hundred eighty-seven billion, six hundred fifty-four million, four hundred thirty-three thousand, two hundred twenty-one".