4021431660444 has 96 divisors (see below), whose sum is σ = 10291575087360. Its totient is φ = 1212058944000.

The previous prime is 4021431660443. The next prime is 4021431660451. The reversal of 4021431660444 is 4440661341204.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021431660443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21246087 + ... + 21434529.

It is an arithmetic number, because the mean of its divisors is an integer number (107203907160).

Almost surely, 2^{4021431660444} is an apocalyptic number.

4021431660444 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4021431660444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5145787543680).

4021431660444 is an abundant number, since it is smaller than the sum of its proper divisors (6270143426916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4021431660444 is a wasteful number, since it uses less digits than its factorization.

4021431660444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189331 (or 189329 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 39.

The spelling of 4021431660444 in words is "four trillion, twenty-one billion, four hundred thirty-one million, six hundred sixty thousand, four hundred forty-four".