221706360427755 has 128 divisors (see below), whose sum is σ = 417229938671616. Its totient is φ = 98418679603200.

The previous prime is 221706360427709. The next prime is 221706360427757. The reversal of 221706360427755 is 557724063607122.

It is not a de Polignac number, because 221706360427755 - 2¹¹ = 221706360425707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221706360427695 and 221706360427704.

It is not an unprimeable number, because it can be changed into a prime (221706360427757) 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 127 ways as a sum of consecutive naturals, for example, 6509844687 + ... + 6509878743.

It is an arithmetic number, because the mean of its divisors is an integer number (3259608895872).

Almost surely, 2^{221706360427755} is an apocalyptic number.

221706360427755 is a deficient number, since it is larger than the sum of its proper divisors (195523578243861).

221706360427755 is a wasteful number, since it uses less digits than its factorization.

221706360427755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41117.

The product of its (nonzero) digits is 29635200, while the sum is 57.

The spelling of 221706360427755 in words is "two hundred twenty-one trillion, seven hundred six billion, three hundred sixty million, four hundred twenty-seven thousand, seven hundred fifty-five".