71126021 has 8 divisors (see below), whose sum is σ = 73143000. Its totient is φ = 69122560.

The previous prime is 71125981. The next prime is 71126023. The reversal of 71126021 is 12062117.

It can be written as a sum of positive squares in 4 ways, for example, as 1653796 + 69472225 = 1286^2 + 8335^2 .

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 71126021 - 2¹⁰ = 71124997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71125984 and 71126002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71126023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7805 + ... + 14253.

It is an arithmetic number, because the mean of its divisors is an integer number (9142875).

Almost surely, 2^71126021 is an apocalyptic number.

It is an amenable number.

71126021 is a deficient number, since it is larger than the sum of its proper divisors (2016979).

71126021 is a wasteful number, since it uses less digits than its factorization.

71126021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6759.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 71126021 is about 8433.6244284412. The cubic root of 71126021 is about 414.3266207442.

Adding to 71126021 its reverse (12062117), we get a palindrome (83188138).

The spelling of 71126021 in words is "seventy-one million, one hundred twenty-six thousand, twenty-one".