71161021 has 8 divisors (see below), whose sum is σ = 72944640. Its totient is φ = 69396768.

The previous prime is 71161019. The next prime is 71161037. The reversal of 71161021 is 12016117.

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 71161021 - 2¹ = 71161019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71161021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71161081) 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, 2745 + ... + 12241.

It is an arithmetic number, because the mean of its divisors is an integer number (9118080).

Almost surely, 2^71161021 is an apocalyptic number.

It is an amenable number.

71161021 is a deficient number, since it is larger than the sum of its proper divisors (1783619).

71161021 is a wasteful number, since it uses less digits than its factorization.

71161021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9683.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 71161021 is about 8435.6992004220. The cubic root of 71161021 is about 414.3945708115.

Adding to 71161021 its reverse (12016117), we get a palindrome (83177138).

The spelling of 71161021 in words is "seventy-one million, one hundred sixty-one thousand, twenty-one".