221170071 has 8 divisors (see below), whose sum is σ = 298933360. Its totient is φ = 145426752.

The previous prime is 221170069. The next prime is 221170099. The reversal of 221170071 is 170071122.

It is a happy number.

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

It is not a de Polignac number, because 221170071 - 2¹ = 221170069 is a prime.

It is a super-2 number, since 2×221170071² = 97832400612290082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221174071) 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, 504736 + ... + 505173.

It is an arithmetic number, because the mean of its divisors is an integer number (37366670).

Almost surely, 2^221170071 is an apocalyptic number.

221170071 is a deficient number, since it is larger than the sum of its proper divisors (77763289).

221170071 is a wasteful number, since it uses less digits than its factorization.

221170071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009985.

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 221170071 is about 14871.7877539992. The cubic root of 221170071 is about 604.7494087754.

The spelling of 221170071 in words is "two hundred twenty-one million, one hundred seventy thousand, seventy-one".