825103421 has 2 divisors, whose sum is σ = 825103422. Its totient is φ = 825103420.

The previous prime is 825103373. The next prime is 825103453. The reversal of 825103421 is 124301528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 449906521 + 375196900 = 21211^2 + 19370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-825103421 is a prime.

It is a Sophie Germain prime.

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 (825103021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412551710 + 412551711.

It is an arithmetic number, because the mean of its divisors is an integer number (412551711).

Almost surely, 2^825103421 is an apocalyptic number.

It is an amenable number.

825103421 is a deficient number, since it is larger than the sum of its proper divisors (1).

825103421 is an equidigital number, since it uses as much as digits as its factorization.

825103421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 825103421 is about 28724.6135047976. The cubic root of 825103421 is about 937.9279169106.

Adding to 825103421 its reverse (124301528), we get a palindrome (949404949).

The spelling of 825103421 in words is "eight hundred twenty-five million, one hundred three thousand, four hundred twenty-one".