103106821 has 2 divisors, whose sum is σ = 103106822. Its totient is φ = 103106820.

The previous prime is 103106813. The next prime is 103106867. The reversal of 103106821 is 128601301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52852900 + 50253921 = 7270^2 + 7089^2 .

It is an emirp because it is prime and its reverse (128601301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 103106821 - 2³ = 103106813 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 103106792 and 103106801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103106881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51553410 + 51553411.

It is an arithmetic number, because the mean of its divisors is an integer number (51553411).

Almost surely, 2^103106821 is an apocalyptic number.

It is an amenable number.

103106821 is a deficient number, since it is larger than the sum of its proper divisors (1).

103106821 is an equidigital number, since it uses as much as digits as its factorization.

103106821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 103106821 is about 10154.1528942596. The cubic root of 103106821 is about 468.9168068621.

The spelling of 103106821 in words is "one hundred three million, one hundred six thousand, eight hundred twenty-one".