71166221 has 8 divisors (see below), whose sum is σ = 81454464. Its totient is φ = 60908400.

The previous prime is 71166217. The next prime is 71166239. The reversal of 71166221 is 12266117.

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

It is not a de Polignac number, because 71166221 - 2² = 71166217 is a prime.

It is a super-2 number, since 2×71166221² = 10129262022841682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71163221) 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, 2345 + ... + 12158.

It is an arithmetic number, because the mean of its divisors is an integer number (10181808).

Almost surely, 2^71166221 is an apocalyptic number.

It is an amenable number.

71166221 is a deficient number, since it is larger than the sum of its proper divisors (10288243).

71166221 is a wasteful number, since it uses less digits than its factorization.

71166221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15211.

The product of its digits is 1008, while the sum is 26.

The square root of 71166221 is about 8436.0074087213. The cubic root of 71166221 is about 414.4046643489.

The spelling of 71166221 in words is "seventy-one million, one hundred sixty-six thousand, two hundred twenty-one".