1244243421 has 6 divisors (see below), whose sum is σ = 1797240510. Its totient is φ = 829495608.

The previous prime is 1244243387. The next prime is 1244243449. The reversal of 1244243421 is 1243424421.

It can be written as a sum of positive squares in only one way, i.e., 784784196 + 459459225 = 28014^2 + 21435^2 .

It is not a de Polignac number, because 1244243421 - 2⁷ = 1244243293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244243491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69124626 + ... + 69124643.

It is an arithmetic number, because the mean of its divisors is an integer number (299540085).

Almost surely, 2^1244243421 is an apocalyptic number.

It is an amenable number.

1244243421 is a deficient number, since it is larger than the sum of its proper divisors (552997089).

1244243421 is a wasteful number, since it uses less digits than its factorization.

1244243421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138249275 (or 138249272 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

The square root of 1244243421 is about 35273.8347929453. The cubic root of 1244243421 is about 1075.5611769123.

Adding to 1244243421 its reverse (1243424421), we get a palindrome (2487667842).

The spelling of 1244243421 in words is "one billion, two hundred forty-four million, two hundred forty-three thousand, four hundred twenty-one".