2108354821 has 2 divisors, whose sum is σ = 2108354822. Its totient is φ = 2108354820.

The previous prime is 2108354803. The next prime is 2108354863. The reversal of 2108354821 is 1284538012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1587145921 + 521208900 = 39839^2 + 22830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2108354821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2108354221) by changing a digit.

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 as a sum of consecutive naturals, namely, 1054177410 + 1054177411.

It is an arithmetic number, because the mean of its divisors is an integer number (1054177411).

Almost surely, 2^2108354821 is an apocalyptic number.

It is an amenable number.

2108354821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2108354821 is an equidigital number, since it uses as much as digits as its factorization.

2108354821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 2108354821 is about 45916.8250317898. The cubic root of 2108354821 is about 1282.2751732981.

The spelling of 2108354821 in words is "two billion, one hundred eight million, three hundred fifty-four thousand, eight hundred twenty-one".