4001721140 has 12 divisors (see below), whose sum is σ = 8403614436. Its totient is φ = 1600688448.

The previous prime is 4001721109. The next prime is 4001721167. The reversal of 4001721140 is 411271004.

It can be written as a sum of positive squares in 2 ways, for example, as 1342049956 + 2659671184 = 36634^2 + 51572^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 200086057 = 4001721140 / (4 + 0 + 0 + 1 + 7 + 2 + 1 + 1 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100043009 + ... + 100043048.

It is an arithmetic number, because the mean of its divisors is an integer number (700301203).

Almost surely, 2^4001721140 is an apocalyptic number.

It is an amenable number.

4001721140 is an abundant number, since it is smaller than the sum of its proper divisors (4401893296).

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

4001721140 is a wasteful number, since it uses less digits than its factorization.

4001721140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200086066 (or 200086064 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 4001721140 is about 63259.1585464113. The cubic root of 4001721140 is about 1587.6286976077.

Adding to 4001721140 its reverse (411271004), we get a palindrome (4412992144).

The spelling of 4001721140 in words is "four billion, one million, seven hundred twenty-one thousand, one hundred forty".