1244021 has 2 divisors, whose sum is σ = 1244022. Its totient is φ = 1244020.

The previous prime is 1244003. The next prime is 1244027. The reversal of 1244021 is 1204421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1240996 + 3025 = 1114^2 + 55^2 .

It is an emirp because it is prime and its reverse (1204421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1244021 - 2¹⁴ = 1227637 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1243987 and 1244005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1244027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622010 + 622011.

It is an arithmetic number, because the mean of its divisors is an integer number (622011).

2^1244021 is an apocalyptic number.

It is an amenable number.

1244021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244021 is an equidigital number, since it uses as much as digits as its factorization.

1244021 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 1244021 is about 1115.3568935547. The cubic root of 1244021 is about 107.5497083974.

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

The spelling of 1244021 in words is "one million, two hundred forty-four thousand, twenty-one".