40444120121 has 4 divisors (see below), whose sum is σ = 40449133044. Its totient is φ = 40439107200.

The previous prime is 40444120091. The next prime is 40444120243. The reversal of 40444120121 is 12102144404.

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 22964371600 + 17479748521 = 151540^2 + 132211^2 .

It is a cyclic number.

It is not a de Polignac number, because 40444120121 - 2³⁰ = 39370378297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40444110121) 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, 2494340 + ... + 2510501.

It is an arithmetic number, because the mean of its divisors is an integer number (10112283261).

Almost surely, 2^40444120121 is an apocalyptic number.

It is an amenable number.

40444120121 is a deficient number, since it is larger than the sum of its proper divisors (5012923).

40444120121 is an equidigital number, since it uses as much as digits as its factorization.

40444120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5012922.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 40444120121 its reverse (12102144404), we get a palindrome (52546264525).

The spelling of 40444120121 in words is "forty billion, four hundred forty-four million, one hundred twenty thousand, one hundred twenty-one".