221565500127 has 24 divisors (see below), whose sum is σ = 322016333600. Its totient is φ = 146799449280.

The previous prime is 221565500113. The next prime is 221565500129. The reversal of 221565500127 is 721005565122.

221565500127 is a `hidden beast` number, since 2 + 21 + 5 + 6 + 5 + 500 + 127 = 666.

It is not a de Polignac number, because 221565500127 - 2⁶ = 221565500063 is a prime.

It is a super-2 number, since 2×221565500127² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221565500091 and 221565500100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221565500129) 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 23 ways as a sum of consecutive naturals, for example, 1500177 + ... + 1641237.

Almost surely, 2^221565500127 is an apocalyptic number.

221565500127 is a deficient number, since it is larger than the sum of its proper divisors (100450833473).

221565500127 is a wasteful number, since it uses less digits than its factorization.

221565500127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142143 (or 142140 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 36.

The spelling of 221565500127 in words is "two hundred twenty-one billion, five hundred sixty-five million, five hundred thousand, one hundred twenty-seven".