4021721704 has 128 divisors (see below), whose sum is σ = 10291841280. Its totient is φ = 1422489600.

The previous prime is 4021721689. The next prime is 4021721713. The reversal of 4021721704 is 4071271204.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 484372 + ... + 492604.

It is an arithmetic number, because the mean of its divisors is an integer number (80405010).

Almost surely, 2^4021721704 is an apocalyptic number.

4021721704 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 4021721704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5145920640).

4021721704 is an abundant number, since it is smaller than the sum of its proper divisors (6270119576).

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

4021721704 is a wasteful number, since it uses less digits than its factorization.

4021721704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8331 (or 8327 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 4021721704 is about 63417.0458473114. The cubic root of 4021721704 is about 1590.2692876178.

Adding to 4021721704 its reverse (4071271204), we get a palindrome (8092992908).

The spelling of 4021721704 in words is "four billion, twenty-one million, seven hundred twenty-one thousand, seven hundred four".