71133321 has 32 divisors (see below), whose sum is σ = 120821760. Its totient is φ = 36239616.

The previous prime is 71133311. The next prime is 71133329. The reversal of 71133321 is 12333117.

It is not a de Polignac number, because 71133321 - 2⁷ = 71133193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71133329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1540 + ... + 12026.

It is an arithmetic number, because the mean of its divisors is an integer number (3775680).

Almost surely, 2^71133321 is an apocalyptic number.

It is an amenable number.

71133321 is a deficient number, since it is larger than the sum of its proper divisors (49688439).

71133321 is a wasteful number, since it uses less digits than its factorization.

71133321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10533.

The product of its digits is 378, while the sum is 21.

The square root of 71133321 is about 8434.0572087223. The cubic root of 71133321 is about 414.3407950263.

Adding to 71133321 its reverse (12333117), we get a palindrome (83466438).

The spelling of 71133321 in words is "seventy-one million, one hundred thirty-three thousand, three hundred twenty-one".