221745154287171 has 8 divisors (see below), whose sum is σ = 301238700163920. Its totient is φ = 145040855634272.

The previous prime is 221745154287149. The next prime is 221745154287259. The reversal of 221745154287171 is 171782451547122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221745154287171 - 2⁴³ = 212949061264963 is a prime.

It is a super-2 number, since 2×221745154287171² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221745154287071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 697311805776 + ... + 697311806093.

It is an arithmetic number, because the mean of its divisors is an integer number (37654837520490).

Almost surely, 2^{221745154287171} is an apocalyptic number.

221745154287171 is a deficient number, since it is larger than the sum of its proper divisors (79493545876749).

221745154287171 is a wasteful number, since it uses less digits than its factorization.

221745154287171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394623611925.

The product of its digits is 8780800, while the sum is 57.

The spelling of 221745154287171 in words is "two hundred twenty-one trillion, seven hundred forty-five billion, one hundred fifty-four million, two hundred eighty-seven thousand, one hundred seventy-one".