1244013421 has 6 divisors (see below), whose sum is σ = 1447117710. Its totient is φ = 1066297176.

The previous prime is 1244013413. The next prime is 1244013439. The reversal of 1244013421 is 1243104421.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 780084900 + 463928521 = 27930^2 + 21539^2 .

It is not a de Polignac number, because 1244013421 - 2³ = 1244013413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1244013392 and 1244013401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244013481) 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, 12693966 + ... + 12694063.

It is an arithmetic number, because the mean of its divisors is an integer number (241186285).

Almost surely, 2^1244013421 is an apocalyptic number.

It is an amenable number.

1244013421 is a deficient number, since it is larger than the sum of its proper divisors (203104289).

1244013421 is an equidigital number, since it uses as much as digits as its factorization.

1244013421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25388043 (or 25388036 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1244013421 is about 35270.5744353562. The cubic root of 1244013421 is about 1075.4948998717.

Adding to 1244013421 its reverse (1243104421), we get a palindrome (2487117842).

The spelling of 1244013421 in words is "one billion, two hundred forty-four million, thirteen thousand, four hundred twenty-one".