40444044442421 has 4 divisors (see below), whose sum is σ = 40444452724992. Its totient is φ = 40443636159852.

The previous prime is 40444044442411. The next prime is 40444044442433. The reversal of 40444044442421 is 12424444044404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40444044442421 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 (40444044442411) 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, 203992661 + ... + 204190826.

It is an arithmetic number, because the mean of its divisors is an integer number (10111113181248).

Almost surely, 2^{40444044442421} is an apocalyptic number.

It is an amenable number.

40444044442421 is a deficient number, since it is larger than the sum of its proper divisors (408282571).

40444044442421 is an equidigital number, since it uses as much as digits as its factorization.

40444044442421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408282570.

The product of its (nonzero) digits is 1048576, while the sum is 41.

Adding to 40444044442421 its reverse (12424444044404), we get a palindrome (52868488486825).

The spelling of 40444044442421 in words is "forty trillion, four hundred forty-four billion, forty-four million, four hundred forty-two thousand, four hundred twenty-one".