1244041021 has 4 divisors (see below), whose sum is σ = 1258019100. Its totient is φ = 1230062944.

The previous prime is 1244040991. The next prime is 1244041027. The reversal of 1244041021 is 1201404421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 246176100 + 997864921 = 15690^2 + 31589^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244041021 - 2¹⁷ = 1243909949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1244041021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244041027) 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, 6988906 + ... + 6989083.

It is an arithmetic number, because the mean of its divisors is an integer number (314504775).

Almost surely, 2^1244041021 is an apocalyptic number.

It is an amenable number.

1244041021 is a deficient number, since it is larger than the sum of its proper divisors (13978079).

1244041021 is an equidigital number, since it uses as much as digits as its factorization.

1244041021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13978078.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1244041021 is about 35270.9656941797. The cubic root of 1244041021 is about 1075.5028535479.

Adding to 1244041021 its reverse (1201404421), we get a palindrome (2445445442).

The spelling of 1244041021 in words is "one billion, two hundred forty-four million, forty-one thousand, twenty-one".