4221720340544 has 28 divisors (see below), whose sum is σ = 9574258630464. Its totient is φ = 1809308717184.

The previous prime is 4221720340507. The next prime is 4221720340549. The reversal of 4221720340544 is 4450430271224.

It is a tau number, because it is divible by the number of its divisors (28).

It is a junction number, because it is equal to n+sod(n) for n = 4221720340498 and 4221720340507.

It is not an unprimeable number, because it can be changed into a prime (4221720340549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4711741004 + ... + 4711741899.

Almost surely, 2^{4221720340544} is an apocalyptic number.

It is an amenable number.

4221720340544 is an abundant number, since it is smaller than the sum of its proper divisors (5352538289920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4221720340544 is an equidigital number, since it uses as much as digits as its factorization.

4221720340544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9423482922 (or 9423482912 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 38.

The spelling of 4221720340544 in words is "four trillion, two hundred twenty-one billion, seven hundred twenty million, three hundred forty thousand, five hundred forty-four".