103412821 has 2 divisors, whose sum is σ = 103412822. Its totient is φ = 103412820.

The previous prime is 103412809. The next prime is 103412843. The reversal of 103412821 is 128214301.

It is a happy number.

It is an a-pointer prime, because the next prime (103412843) can be obtained adding 103412821 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85655025 + 17757796 = 9255^2 + 4214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-103412821 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 103412792 and 103412801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103412851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51706410 + 51706411.

It is an arithmetic number, because the mean of its divisors is an integer number (51706411).

Almost surely, 2^103412821 is an apocalyptic number.

It is an amenable number.

103412821 is a deficient number, since it is larger than the sum of its proper divisors (1).

103412821 is an equidigital number, since it uses as much as digits as its factorization.

103412821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 103412821 is about 10169.2094579667. The cubic root of 103412821 is about 469.3802318384.

The spelling of 103412821 in words is "one hundred three million, four hundred twelve thousand, eight hundred twenty-one".