71106821 has 8 divisors (see below), whose sum is σ = 72936864. Its totient is φ = 69284880.

The previous prime is 71106803. The next prime is 71106851. The reversal of 71106821 is 12860117.

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 71106821 - 2⁶ = 71106757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71106851) 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, 18311 + ... + 21851.

It is an arithmetic number, because the mean of its divisors is an integer number (9117108).

Almost surely, 2^71106821 is an apocalyptic number.

It is an amenable number.

71106821 is a deficient number, since it is larger than the sum of its proper divisors (1830043).

71106821 is a wasteful number, since it uses less digits than its factorization.

71106821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 71106821 is about 8432.4860509816. The cubic root of 71106821 is about 414.2893358100.

Adding to 71106821 its reverse (12860117), we get a palindrome (83966938).

It can be divided in two parts, 7110 and 6821, that added together give a palindrome (13931).

The spelling of 71106821 in words is "seventy-one million, one hundred six thousand, eight hundred twenty-one".