444492400421 has 4 divisors (see below), whose sum is σ = 446433415500. Its totient is φ = 442551385344.

The previous prime is 444492400411. The next prime is 444492400433. The reversal of 444492400421 is 124004294444.

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 305427549025 + 139064851396 = 552655^2 + 372914^2 .

It is a cyclic number.

It is not a de Polignac number, because 444492400421 - 2¹⁰ = 444492399397 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 (444492400411) 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, 970507196 + ... + 970507653.

It is an arithmetic number, because the mean of its divisors is an integer number (111608353875).

Almost surely, 2^444492400421 is an apocalyptic number.

It is an amenable number.

444492400421 is a deficient number, since it is larger than the sum of its proper divisors (1941015079).

444492400421 is a wasteful number, since it uses less digits than its factorization.

444492400421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941015078.

The product of its (nonzero) digits is 147456, while the sum is 38.

Adding to 444492400421 its reverse (124004294444), we get a palindrome (568496694865).

The spelling of 444492400421 in words is "four hundred forty-four billion, four hundred ninety-two million, four hundred thousand, four hundred twenty-one".