71021020001 has 4 divisors (see below), whose sum is σ = 71026979604. Its totient is φ = 71015060400.

The previous prime is 71021019997. The next prime is 71021020013. The reversal of 71021020001 is 10002012017.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10002012017 = 4649 ⋅2151433.

It can be written as a sum of positive squares in 2 ways, for example, as 45396694225 + 25624325776 = 213065^2 + 160076^2 .

It is a cyclic number.

It is not a de Polignac number, because 71021020001 - 2² = 71021019997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71021020501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2961890 + ... + 2985771.

It is an arithmetic number, because the mean of its divisors is an integer number (17756744901).

Almost surely, 2^71021020001 is an apocalyptic number.

It is an amenable number.

71021020001 is a deficient number, since it is larger than the sum of its proper divisors (5959603).

71021020001 is a wasteful number, since it uses less digits than its factorization.

71021020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5959602.

The product of its (nonzero) digits is 28, while the sum is 14.

Adding to 71021020001 its reverse (10002012017), we get a palindrome (81023032018).

The spelling of 71021020001 in words is "seventy-one billion, twenty-one million, twenty thousand, one".