1244230021 has 4 divisors (see below), whose sum is σ = 1247795500. Its totient is φ = 1240664544.

The previous prime is 1244229997. The next prime is 1244230063. The reversal of 1244230021 is 1200324421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1200324421 = 641 ⋅1872581.

It can be written as a sum of positive squares in 2 ways, for example, as 679644900 + 564585121 = 26070^2 + 23761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244230021 - 2⁵ = 1244229989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244230081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1782216 + ... + 1782913.

It is an arithmetic number, because the mean of its divisors is an integer number (311948875).

Almost surely, 2^1244230021 is an apocalyptic number.

It is an amenable number.

1244230021 is a deficient number, since it is larger than the sum of its proper divisors (3565479).

1244230021 is an equidigital number, since it uses as much as digits as its factorization.

1244230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3565478.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1244230021 is about 35273.6448499443. The cubic root of 1244230021 is about 1075.5573157784.

Adding to 1244230021 its reverse (1200324421), we get a palindrome (2444554442).

The spelling of 1244230021 in words is "one billion, two hundred forty-four million, two hundred thirty thousand, twenty-one".