1230021 has 12 divisors (see below), whose sum is σ = 1913548. Its totient is φ = 756864.

The previous prime is 1230013. The next prime is 1230023. The reversal of 1230021 is 1200321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 50625 + 1179396 = 225^2 + 1086^2 .

It is not a de Polignac number, because 1230021 - 2³ = 1230013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1229985 and 1230012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5140 + ... + 5373.

2^1230021 is an apocalyptic number.

It is an amenable number.

1230021 is a deficient number, since it is larger than the sum of its proper divisors (683527).

1230021 is a wasteful number, since it uses less digits than its factorization.

1230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10532 (or 10529 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1230021 is about 1109.0631181317. The cubic root of 1230021 is about 107.1447367289.

Adding to 1230021 its reverse (1200321), we get a palindrome (2430342).

It can be divided in two parts, 12300 and 21, that added together give a palindrome (12321).

The spelling of 1230021 in words is "one million, two hundred thirty thousand, twenty-one".