103311821 has 2 divisors, whose sum is σ = 103311822. Its totient is φ = 103311820.

The previous prime is 103311779. The next prime is 103311827. The reversal of 103311821 is 128113301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81090025 + 22221796 = 9005^2 + 4714^2 .

It is an emirp because it is prime and its reverse (128113301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 103311821 - 2¹⁰ = 103310797 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 103311793 and 103311802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103311827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51655910 + 51655911.

It is an arithmetic number, because the mean of its divisors is an integer number (51655911).

Almost surely, 2^103311821 is an apocalyptic number.

It is an amenable number.

103311821 is a deficient number, since it is larger than the sum of its proper divisors (1).

103311821 is an equidigital number, since it uses as much as digits as its factorization.

103311821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 103311821 is about 10164.2422737753. The cubic root of 103311821 is about 469.2273725021.

The spelling of 103311821 in words is "one hundred three million, three hundred eleven thousand, eight hundred twenty-one".