221457306865 has 16 divisors (see below), whose sum is σ = 267843824640. Its totient is φ = 175770887040.

The previous prime is 221457306859. The next prime is 221457306869. The reversal of 221457306865 is 568603754122.

221457306865 is digitally balanced in base 11, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221457306865 - 2²¹ = 221455209713 is a prime.

It is a super-2 number, since 2×221457306865² (a number of 23 digits) contains 22 as substring.

221457306865 is strictly pandigital in base 11.

It is not an unprimeable number, because it can be changed into a prime (221457306869) 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, 914037 + ... + 1130653.

It is an arithmetic number, because the mean of its divisors is an integer number (16740239040).

Almost surely, 2^221457306865 is an apocalyptic number.

It is an amenable number.

221457306865 is a deficient number, since it is larger than the sum of its proper divisors (46386517775).

221457306865 is a wasteful number, since it uses less digits than its factorization.

221457306865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218232.

The product of its (nonzero) digits is 2419200, while the sum is 49.

The spelling of 221457306865 in words is "two hundred twenty-one billion, four hundred fifty-seven million, three hundred six thousand, eight hundred sixty-five".