1204421 has 2 divisors, whose sum is σ = 1204422. Its totient is φ = 1204420.

The previous prime is 1204409. The next prime is 1204447. The reversal of 1204421 is 1244021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 923521 + 280900 = 961^2 + 530^2 .

It is an emirp because it is prime and its reverse (1244021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1204421 - 2¹⁴ = 1188037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1204396 and 1204405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1204451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602210 + 602211.

It is an arithmetic number, because the mean of its divisors is an integer number (602211).

2^1204421 is an apocalyptic number.

It is an amenable number.

1204421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204421 is an equidigital number, since it uses as much as digits as its factorization.

1204421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1204421 is about 1097.4611610440. The cubic root of 1204421 is about 106.3961973597.

Adding to 1204421 its reverse (1244021), we get a palindrome (2448442).

The spelling of 1204421 in words is "one million, two hundred four thousand, four hundred twenty-one".