4021665000 has 160 divisors (see below), whose sum is σ = 13111053120. Its totient is φ = 1025728000.

The previous prime is 4021664989. The next prime is 4021665007. The reversal of 4021665000 is 5661204.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (4021665007) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 339172 + ... + 350828.

It is an arithmetic number, because the mean of its divisors is an integer number (81944082).

Almost surely, 2^4021665000 is an apocalyptic number.

4021665000 is a gapful number since it is divisible by the number (40) 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 4021665000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6555526560).

4021665000 is an abundant number, since it is smaller than the sum of its proper divisors (9089388120).

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

4021665000 is a wasteful number, since it uses less digits than its factorization.

4021665000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11709 (or 11690 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 4021665000 is about 63416.5987735072. The cubic root of 4021665000 is about 1590.2618136171.

The spelling of 4021665000 in words is "four billion, twenty-one million, six hundred sixty-five thousand".