8820477131821 has 32 divisors (see below), whose sum is σ = 9331002061920. Its totient is φ = 8326621900800.

The previous prime is 8820477131717. The next prime is 8820477131839. The reversal of 8820477131821 is 1281317740288.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 5110827789796 + 3709649342025 = 2260714^2 + 1926045^2 .

It is a cyclic number.

It is not a de Polignac number, because 8820477131821 - 2²³ = 8820468743213 is a prime.

It is a super-2 number, since 2×8820477131821² (a number of 27 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 (8820477141821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 887277711 + ... + 887287651.

It is an arithmetic number, because the mean of its divisors is an integer number (291593814435).

Almost surely, 2^{8820477131821} is an apocalyptic number.

It is an amenable number.

8820477131821 is a deficient number, since it is larger than the sum of its proper divisors (510524930099).

8820477131821 is a wasteful number, since it uses less digits than its factorization.

8820477131821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13185.

The product of its (nonzero) digits is 1204224, while the sum is 52.

The spelling of 8820477131821 in words is "eight trillion, eight hundred twenty billion, four hundred seventy-seven million, one hundred thirty-one thousand, eight hundred twenty-one".