71002000130021 has 4 divisors (see below), whose sum is σ = 71002610895372. Its totient is φ = 71001389364672.

The previous prime is 71002000129969. The next prime is 71002000130023. The reversal of 71002000130021 is 12003100020017.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66809600553796 + 4192399576225 = 8173714^2 + 2047535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71002000130021 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 (71002000130023) 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, 305208266 + ... + 305440811.

It is an arithmetic number, because the mean of its divisors is an integer number (17750652723843).

Almost surely, 2^{71002000130021} is an apocalyptic number.

It is an amenable number.

71002000130021 is a deficient number, since it is larger than the sum of its proper divisors (610765351).

71002000130021 is a wasteful number, since it uses less digits than its factorization.

71002000130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610765350.

The product of its (nonzero) digits is 84, while the sum is 17.

Adding to 71002000130021 its reverse (12003100020017), we get a palindrome (83005100150038).

The spelling of 71002000130021 in words is "seventy-one trillion, two billion, one hundred thirty thousand, twenty-one".