71171021 has 8 divisors (see below), whose sum is σ = 72240000. Its totient is φ = 70106400.

The previous prime is 71170999. The next prime is 71171029. The reversal of 71171021 is 12017117.

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 71171021 - 2²² = 66976717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71170984 and 71171002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71171029) 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, 46730 + ... + 48228.

It is an arithmetic number, because the mean of its divisors is an integer number (9030000).

Almost surely, 2^71171021 is an apocalyptic number.

It is an amenable number.

71171021 is a deficient number, since it is larger than the sum of its proper divisors (1068979).

71171021 is a wasteful number, since it uses less digits than its factorization.

71171021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179.

The product of its (nonzero) digits is 98, while the sum is 20.

The square root of 71171021 is about 8436.2918986958. The cubic root of 71171021 is about 414.4139810239.

Adding to 71171021 its reverse (12017117), we get a palindrome (83188138).

The spelling of 71171021 in words is "seventy-one million, one hundred seventy-one thousand, twenty-one".