71307633421 has 4 divisors (see below), whose sum is σ = 71326417212. Its totient is φ = 71288849632.

The previous prime is 71307633389. The next prime is 71307633443. The reversal of 71307633421 is 12433670317.

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 5232930921 + 66074702500 = 72339^2 + 257050^2 .

It is a cyclic number.

It is not a de Polignac number, because 71307633421 - 2⁵ = 71307633389 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 (71307630421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9386200 + ... + 9393793.

It is an arithmetic number, because the mean of its divisors is an integer number (17831604303).

Almost surely, 2^71307633421 is an apocalyptic number.

It is an amenable number.

71307633421 is a deficient number, since it is larger than the sum of its proper divisors (18783791).

71307633421 is a wasteful number, since it uses less digits than its factorization.

71307633421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18783790.

The product of its (nonzero) digits is 63504, while the sum is 37.

The spelling of 71307633421 in words is "seventy-one billion, three hundred seven million, six hundred thirty-three thousand, four hundred twenty-one".