4221871785265 has 16 divisors (see below), whose sum is σ = 5229583798032. Its totient is φ = 3269532397824.

The previous prime is 4221871785163. The next prime is 4221871785269. The reversal of 4221871785265 is 5625871781224.

It can be written as a sum of positive squares in 8 ways, for example, as 1486407187489 + 2735464597776 = 1219183^2 + 1653924^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221871785265 - 2⁷ = 4221871785137 is a prime.

It is a super-2 number, since 2×4221871785265² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4221871785269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57884694 + ... + 57957583.

It is an arithmetic number, because the mean of its divisors is an integer number (326848987377).

Almost surely, 2^{4221871785265} is an apocalyptic number.

It is an amenable number.

4221871785265 is a deficient number, since it is larger than the sum of its proper divisors (1007712012767).

4221871785265 is a wasteful number, since it uses less digits than its factorization.

4221871785265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115842516.

The product of its digits is 15052800, while the sum is 58.

The spelling of 4221871785265 in words is "four trillion, two hundred twenty-one billion, eight hundred seventy-one million, seven hundred eighty-five thousand, two hundred sixty-five".