444404400402421 has 4 divisors (see below), whose sum is σ = 459728690071500. Its totient is φ = 429080110733344.

The previous prime is 444404400402409. The next prime is 444404400402433. The reversal of 444404400402421 is 124204004404444.

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

It is an interprime number because it is at equal distance from previous prime (444404400402409) and next prime (444404400402433).

It can be written as a sum of positive squares in 2 ways, for example, as 312548808902500 + 131855591499921 = 17679050^2 + 11482839^2 .

It is a cyclic number.

It is not a de Polignac number, because 444404400402421 - 2³⁹ = 443854644588533 is a prime.

It is a super-2 number, since 2×444404400402421² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444404400405421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7662144834496 + ... + 7662144834553.

It is an arithmetic number, because the mean of its divisors is an integer number (114932172517875).

Almost surely, 2^{444404400402421} is an apocalyptic number.

It is an amenable number.

444404400402421 is a deficient number, since it is larger than the sum of its proper divisors (15324289669079).

444404400402421 is a wasteful number, since it uses less digits than its factorization.

444404400402421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15324289669078.

The product of its (nonzero) digits is 262144, while the sum is 37.

Adding to 444404400402421 its reverse (124204004404444), we get a palindrome (568608404806865).

The spelling of 444404400402421 in words is "four hundred forty-four trillion, four hundred four billion, four hundred million, four hundred two thousand, four hundred twenty-one".