103071821 has 2 divisors, whose sum is σ = 103071822. Its totient is φ = 103071820.

The previous prime is 103071797. The next prime is 103071823. The reversal of 103071821 is 128170301.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88548100 + 14523721 = 9410^2 + 3811^2 .

It is a cyclic number.

It is not a de Polignac number, because 103071821 - 2¹⁸ = 102809677 is a prime.

It is a Sophie Germain prime.

Together with 103071823, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103071823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51535910 + 51535911.

It is an arithmetic number, because the mean of its divisors is an integer number (51535911).

Almost surely, 2^103071821 is an apocalyptic number.

It is an amenable number.

103071821 is a deficient number, since it is larger than the sum of its proper divisors (1).

103071821 is an equidigital number, since it uses as much as digits as its factorization.

103071821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 103071821 is about 10152.4293151935. The cubic root of 103071821 is about 468.8637423300.

The spelling of 103071821 in words is "one hundred three million, seventy-one thousand, eight hundred twenty-one".