445531221421 has 16 divisors (see below), whose sum is σ = 523465145280. Its totient is φ = 373841032320.

The previous prime is 445531221413. The next prime is 445531221439. The reversal of 445531221421 is 124122135544.

It is a cyclic number.

It is not a de Polignac number, because 445531221421 - 2³ = 445531221413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445531321421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1668841 + ... + 1917313.

It is an arithmetic number, because the mean of its divisors is an integer number (32716571580).

Almost surely, 2^445531221421 is an apocalyptic number.

It is an amenable number.

445531221421 is a deficient number, since it is larger than the sum of its proper divisors (77933923859).

445531221421 is a wasteful number, since it uses less digits than its factorization.

445531221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261036.

The product of its digits is 38400, while the sum is 34.

Adding to 445531221421 its reverse (124122135544), we get a palindrome (569653356965).

The spelling of 445531221421 in words is "four hundred forty-five billion, five hundred thirty-one million, two hundred twenty-one thousand, four hundred twenty-one".