2004821352781 has 8 divisors (see below), whose sum is σ = 2199774953880. Its totient is φ = 1815687262272.

The previous prime is 2004821352767. The next prime is 2004821352791. The reversal of 2004821352781 is 1872531284002.

It can be written as a sum of positive squares in 4 ways, for example, as 15407015625 + 1989414337156 = 124125^2 + 1410466^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2004821352781 - 2¹⁷ = 2004821221709 is a prime.

It is a super-2 number, since 2×2004821352781² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2004821352701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1454876926 + ... + 1454878303.

It is an arithmetic number, because the mean of its divisors is an integer number (274971869235).

Almost surely, 2^{2004821352781} is an apocalyptic number.

It is an amenable number.

2004821352781 is a deficient number, since it is larger than the sum of its proper divisors (194953601099).

2004821352781 is a wasteful number, since it uses less digits than its factorization.

2004821352781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909755295.

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 2004821352781 in words is "two trillion, four billion, eight hundred twenty-one million, three hundred fifty-two thousand, seven hundred eighty-one".