71270083921 has 4 divisors (see below), whose sum is σ = 71271441252. Its totient is φ = 71268726592.

The previous prime is 71270083897. The next prime is 71270083981. The reversal of 71270083921 is 12938007217.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12938007217 = 151 ⋅85682167.

It can be written as a sum of positive squares in 2 ways, for example, as 18261468225 + 53008615696 = 135135^2 + 230236^2 .

It is a cyclic number.

It is not a de Polignac number, because 71270083921 - 2⁷ = 71270083793 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71270083981) 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, 596596 + ... + 706021.

It is an arithmetic number, because the mean of its divisors is an integer number (17817860313).

Almost surely, 2^71270083921 is an apocalyptic number.

It is an amenable number.

71270083921 is a deficient number, since it is larger than the sum of its proper divisors (1357331).

71270083921 is a wasteful number, since it uses less digits than its factorization.

71270083921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357330.

The product of its (nonzero) digits is 42336, while the sum is 40.

The spelling of 71270083921 in words is "seventy-one billion, two hundred seventy million, eighty-three thousand, nine hundred twenty-one".