2820549821 has 2 divisors, whose sum is σ = 2820549822. Its totient is φ = 2820549820.

The previous prime is 2820549817. The next prime is 2820549839. The reversal of 2820549821 is 1289450282.

It is a happy number.

2820549821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2403940900 + 416608921 = 49030^2 + 20411^2 .

It is a cyclic number.

It is not a de Polignac number, because 2820549821 - 2² = 2820549817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2820543821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1410274910 + 1410274911.

It is an arithmetic number, because the mean of its divisors is an integer number (1410274911).

Almost surely, 2^2820549821 is an apocalyptic number.

It is an amenable number.

2820549821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2820549821 is an equidigital number, since it uses as much as digits as its factorization.

2820549821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 41.

The square root of 2820549821 is about 53108.8488013062. The cubic root of 2820549821 is about 1412.8994577114.

The spelling of 2820549821 in words is "two billion, eight hundred twenty million, five hundred forty-nine thousand, eight hundred twenty-one".