1244344312021 has 4 divisors (see below), whose sum is σ = 1244395466092. Its totient is φ = 1244293157952.

The previous prime is 1244344311983. The next prime is 1244344312027. The reversal of 1244344312021 is 1202134434421.

It is a happy number.

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 921619200100 + 322725111921 = 960010^2 + 568089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1244344312021 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 (1244344312027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25540530 + ... + 25589203.

It is an arithmetic number, because the mean of its divisors is an integer number (311098866523).

Almost surely, 2^{1244344312021} is an apocalyptic number.

It is an amenable number.

1244344312021 is a deficient number, since it is larger than the sum of its proper divisors (51154071).

1244344312021 is an equidigital number, since it uses as much as digits as its factorization.

1244344312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51154070.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 1244344312021 its reverse (1202134434421), we get a palindrome (2446478746442).

The spelling of 1244344312021 in words is "one trillion, two hundred forty-four billion, three hundred forty-four million, three hundred twelve thousand, twenty-one".