421443520055444 has 24 divisors (see below), whose sum is σ = 752370600922920. Its totient is φ = 206490320351744.

The previous prime is 421443520055431. The next prime is 421443520055449. The reversal of 421443520055444 is 444550025344124.

It can be written as a sum of positive squares in 4 ways, for example, as 105862080544900 + 315581439510544 = 10288930^2 + 17764612^2 .

It is a super-2 number, since 2×421443520055444² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421443520055449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1228469489 + ... + 1228812504.

It is an arithmetic number, because the mean of its divisors is an integer number (31348775038455).

Almost surely, 2^{421443520055444} is an apocalyptic number.

It is an amenable number.

421443520055444 is a deficient number, since it is larger than the sum of its proper divisors (330927080867476).

421443520055444 is a wasteful number, since it uses less digits than its factorization.

421443520055444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457282859 (or 2457282857 counting only the distinct ones).

The product of its (nonzero) digits is 6144000, while the sum is 47.

Adding to 421443520055444 its reverse (444550025344124), we get a palindrome (865993545399568).

The spelling of 421443520055444 in words is "four hundred twenty-one trillion, four hundred forty-three billion, five hundred twenty million, fifty-five thousand, four hundred forty-four".