71211321 has 12 divisors (see below), whose sum is σ = 102946480. Its totient is φ = 47434680.

The previous prime is 71211319. The next prime is 71211331. The reversal of 71211321 is 12311217.

It is a happy number.

It is not a de Polignac number, because 71211321 - 2¹ = 71211319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71211294 and 71211303.

It is not an unprimeable number, because it can be changed into a prime (71211331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11706 + ... + 16716.

Almost surely, 2^71211321 is an apocalyptic number.

It is an amenable number.

71211321 is a deficient number, since it is larger than the sum of its proper divisors (31735159).

71211321 is a wasteful number, since it uses less digits than its factorization.

71211321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6596 (or 6593 counting only the distinct ones).

The product of its digits is 84, while the sum is 18.

The square root of 71211321 is about 8438.6800508136. The cubic root of 71211321 is about 414.4921857574.

Adding to 71211321 its reverse (12311217), we get a palindrome (83522538).

The spelling of 71211321 in words is "seventy-one million, two hundred eleven thousand, three hundred twenty-one".