4521721004840 has 256 divisors, whose sum is σ = 12008681697600. Its totient is φ = 1516195086336.

The previous prime is 4521721004707. The next prime is 4521721004863. The reversal of 4521721004840 is 484001271254.

It can be written as a sum of positive squares in 32 ways, for example, as 682166972356 + 3839554032484 = 825934^2 + 1959478^2 .

It is a super-2 number, since 2×4521721004840² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 4521721004794 and 4521721004803.

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 63 ways as a sum of consecutive naturals, for example, 481183022 + ... + 481192418.

Almost surely, 2^{4521721004840} is an apocalyptic number.

4521721004840 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 4521721004840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6004340848800).

4521721004840 is an abundant number, since it is smaller than the sum of its proper divisors (7486960692760).

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

4521721004840 is a wasteful number, since it uses less digits than its factorization.

4521721004840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11344 (or 11340 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 38.

The spelling of 4521721004840 in words is "four trillion, five hundred twenty-one billion, seven hundred twenty-one million, four thousand, eight hundred forty".