1244133421 has 4 divisors (see below), whose sum is σ = 1244227644. Its totient is φ = 1244039200.

The previous prime is 1244133367. The next prime is 1244133481. The reversal of 1244133421 is 1243314421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1072890025 + 171243396 = 32755^2 + 13086^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244133421 - 2¹⁵ = 1244100653 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 (1244133481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23290 + ... + 55051.

It is an arithmetic number, because the mean of its divisors is an integer number (311056911).

Almost surely, 2^1244133421 is an apocalyptic number.

It is an amenable number.

1244133421 is a deficient number, since it is larger than the sum of its proper divisors (94223).

1244133421 is an equidigital number, since it uses as much as digits as its factorization.

1244133421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94222.

The product of its digits is 2304, while the sum is 25.

The square root of 1244133421 is about 35272.2755290894. The cubic root of 1244133421 is about 1075.5294802164.

Adding to 1244133421 its reverse (1243314421), we get a palindrome (2487447842).

The spelling of 1244133421 in words is "one billion, two hundred forty-four million, one hundred thirty-three thousand, four hundred twenty-one".